Bacillus Strains Improving Health and Performance of Production Animals

ABSTRACT

The present invention relates to animal feed or animal feed additive comprising Bacillus strains which improve the health and performance of production animals. The invention further relates use of the Bacillus strains in animal feed and animal feed additives.

REFERENCE TO A DEPOSIT OF BIOLOGICAL MATERIAL

This application contains a reference to a deposit of biological material, which deposit is incorporated herein by reference.

REFERENCE TO SEQUENCE LISTING

This application contains a Sequence Listing in computer readable form. The computer readable form is incorporated herein by reference.

Index to Sequence Listing:

-   SEQ ID NO: 1 is 16S rDNA of DSM 29869. -   SEQ ID NO: 2 is 16S rDNA of DSM 29870. -   SEQ ID NO: 3 is 16S rDNA of DSM 29871. -   SEQ ID NO: 4 is 16S rDNA of DSM 29872. -   SEQ ID NO: 5 is 16S rDNA of Bacillus vallismortis from AB021198. -   SEQ ID NO: 6 is 16S rDNA of Bacillus subtilis from AJ276351. -   SEQ ID NO: 7 is 16S rDNA of Bacillus amyloliquefaciens from     AB255669. -   SEQ ID NO: 8 to SEQ ID NO: 13: PCR and sequencing primers.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to an animal feed or an animal feed additive comprising Bacillus strains which improve the health and performance of production animals. The invention further relates to use of the Bacillus strains in animal feed and animal feed additives.

Background of the Invention

Clostridium perfringens (C. perfringens) is a Gram-positive, rod-shaped, anaerobic, spore-forming bacterium of the genus Clostridium. C. perfringens is widely present in nature and can be found as a component of decaying vegetation, marine sediment, the intestinal tract of humans and other vertebrates, insects, and soil.

Infections due to C. perfringens show evidence of tissue necrosis, bacteremia, emphysematous cholecystitis, and gas gangrene, which is also known as clostridial myonecrosis. C. perfringens can also result in polymicrobial anaerobic infections.

The incidence of Clostridium perfringens-associated necrotic enteritis in poultry has increased in countries that stopped using antibiotic growth promoters. Necrotic enteritis is an enterotoxemic disease that results in significant economic losses in the poultry industry.

There is a need to develop tools and strategies for the prevention and control of C. perfringens in mono-gastric animals such as poultry. Whilst the vaccination of animals has been suggested, there are challenges associated with vaccinating thousands of animals. Thus discovering a solution which could be administered as an additive in an animal feed would be advantageous.

It is thus an object of the invention to provide solutions which prevents and/or controls C. perfringens in mono-gastric animals such as poultry by use of an animal feed comprising one or more bacteria with activity against Clostridium perfringens.

A further object of the invention is to provide a solution that does not present a risk for the health of the animal. The solution to this problem is use of non-hemolytic Bacillus strains with activity against Clostridium perfringens.

A challenge of delivering Bacillus spp. in feed is the common use of antibiotics as growth promoters in feed. Therefore it is necessary to determine the compatibility of strains with commonly-used feed antibiotics such as monensin in order to identify any potential conflicts with use as a direct fed microbial. The present invention relates in one embodiment to an animal feed or feed additive comprising a Bacillus strain with high compatibility with monensin.

DESCRIPTION OF THE RELATED ART

Knap et al. (2010) describes that Bacillus licheniformis has an effect on necrotic enteritis in broiler chickens (Knap, Lund, Kehlet, Hofacre, and Mathis; Bacillus licheniformis Prevents Necrotic Enteritis in Broiler Chickens; Avian Diseases 54(2):931-935. 2010). This Bacillus licheniformis strain has no effect on Clostridium perfringens in vitro as demonstrated in Example 2.

Clostat (alias Bacillus PB6) is described in WO2007/064741. Bacillus PB6 has antagonistic effect against C. perfringens. Bacillus PB6 is hemolytic as described in Example 1.

SUMMARY OF THE INVENTION

It has been surprisingly found that the addition of direct fed microbes (DFM) from Bacillus species to animal feed can be used to prevent and/or control C. perfringens infections and/or necrotic enteritis in mono-gastric animal such as pigs and/or poultry. The Bacillus species can also improve the body weight gain and/or feed conversion rate (in both Clostridium perfringens challenged and unchallenged chickens).

In a first aspect the invention relates to an animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.

In a second aspect the invention relates to an animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline.

In a third aspect the invention relates to an animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline and

iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.

In a fourth aspect the invention relates to an animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain has enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan.

The present invention relates to animal feed or animal feed additive comprising one or more of the Bacillus strains according to the invention which improves health and performance of production animals.

Methods of feeding an animal with the animal feed or animal feed additive according to the invention and methods of treating a Clostridium perfringens infection and/or for treating necrotic enteritis in an animal is also part of the invention. Use of the animal feed or animal feed additive according to the invention to improve the performance of an animal, such as improving the feed conversion rate, improving the body weight gain and/or improving the feed efficiency and/or improving the health is also part of this invention.

The invention further relates to a method for preventing and/or controlling C. perfringens infections and/or necrotic enteritis in a mono-gastric animal such as swine or poultry by use of an animal feed, wherein the animal feed comprises one or more Bacillus strains selected from the group consisting of the strain having the deposit accession number DSM 29869, DSM 29870, DSM 29871, and DSM 29872, or any combination thereof, wherein the Bacillus strain has antimicrobial activity against Clostridium perfringens and/or E. coli.

In an embodiment, the invention relates to an animal feed that is fed to a mono-gastric animal such as poultry or swine; comprising one or more Bacillus strains selected from the group consisting of the strain having the deposit accession number DSM 29869, DSM 29870, DSM 29871, and DSM 29872, or any combination thereof, wherein the Bacillus strain has antimicrobial activity against Clostridium perfringens and/or E. coli.

In a preferred embodiment the invention relates to an animal feed or an animal feed additive comprising a Bacillus strain wherein:

i. the Bacillus strain is selected from the group consisting of:

the strain having the deposit accession number DSM 29869; a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof,

the strain having the deposit accession number DSM 29870; a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof,

the strain having the deposit accession number DSM 29871; a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof,

the strain having the deposit accession number DSM 29872; and a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof, and

ii. the Bacillus strain has antimicrobial activity against Clostridium perfringens (such as Clostridium perfringens strains 23 or 48 [Gholamiandekhordi et al., 2006. Molecular and phenotypical characterization of Clostridium perfringens isolates from poultry flocks with different disease status, Vet. Microbiol. 113:143-152] and/or E. coli (such as ATCC10536 or ATCC25922).

In a further aspect, the invention relates to a method for preventing and/or controlling C. perfringens infections and/or necrotic enteritis in an animal such as pigs or poultry, comprising the steps of:

(a) feeding an animal such as a pig or poultry; and

(b) administering to an animal such as pigs or poultry one or more Bacillus strains or spores of said strains selected from the group consisting of

the strain having the deposit accession number DSM 29869; a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof,

the strain having the deposit accession number DSM 29870; a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof,

the strain having the deposit accession number DSM 29871; a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof, and

the strain having the deposit accession number DSM 29872; a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof, or any combination thereof, wherein the Bacillus strain has antimicrobial activity against Clostridium perfringens and/or E. coli., and wherein step (a) occurs before, after, or simultaneously with step (b).

In an embodiment, the method relates to an animal feed that is fed to a mono-gastric animal such as pigs and/or poultry. The poultry can, e.g., be chickens (such as broilers and/or layers).

In an embodiment, the animal feed or animal feed additive comprises one of more additional bacteria; is fed to a mono-gastric animal such as pigs and/or poultry; and further comprises concentrate and/or one or more enzymes and/or one or more additional microbes and/or one or more vitamins and/or one or more minerals and/or one or more amino acids and/or one or more other feed ingredients.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 Alignment of 16 S rDNA sequences. SEQ ID NO: 1 (DSM 29869), SEQ ID NO: 2 (DSM 29870), SEQ ID NO: 3 (DSM 29871), SEQ ID NO: 4 (DSM 29872), SEQ ID NO: 5 (Bacillus vallismortis AB021198), SEQ ID NO: 6 (Bacillus subtilis from AJ276351), and SEQ ID NO: 7 (Bacillus amyloliquefaciens AB255669) have been aligned. The region covering position 481-1200 is not shown in FIG. 1 (in this region all sequences are identical).

DEFINITIONS

In general, the terms and phrases used herein have their art-recognized meaning, which can be found by reference to standard texts, journal references, and context known to those skilled in the art. The following definitions are provided to clarify their specific use in context of the disclosure.

As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Animal feed: The term “animal feed” refers to any compound, preparation, or mixture suitable for, or intended for intake by an animal. Animal feed for a mono-gastric animal comprises concentrates as well as for example vitamins, minerals, enzymes, amino acids and/or other feed ingredients (such as in a premix). The animal feed may further comprise forage. An example of poultry feed is given in Example 7.

Antimicrobial activity against Clostridium perfringens: The term “Antimicrobial activity against Clostridium perfringens” means that the growth of Clostridium perfringens is inhibited and/or that some or all of the Clostridium perfringens are killed. This can be determined by the assay described in Example 2.

Blend: the term “blend” means more than one of the bacterial strains described herein.

Body Weight Gain: The Body Weight Gain of an animal is the increase of body weight of the animal over a specified time period. An example of Body Weight Gain determination is given in Example 8.

Composition: The term “composition” refers to a composition comprising a carrier and at least one bacterial strain as described herein. The compositions described herein may be mixed with an animal feed(s) and referred to as a “mash feed.”

Concentrates: The term “concentrates” means feed with high protein and energy concentrations, such as fish meal, molasses, oligosaccharides, sorghum, seeds and grains (either whole or prepared by crushing, milling, etc. from, e.g., corn, oats, rye, barley, wheat), oilseed press cake (e.g., from cottonseed, safflower, sunflower, soybean (such as soybean meal), rapeseed/canola, peanut or groundnut), palm kernel cake, yeast derived material and distillers grains (such as wet distillers grains (WDS) and dried distillers grains with solubles (DDGS)).

Control C. perfringens infections and/or necrotic enteritis: The term “control C. perfringens infections and/or necrotic enteritis” means a method and/or composition that partly or completely inhibits C. perfringens infections and/or necrotic enteritis in an animal. Accordingly, the term “control C. perfringens infections and/or necrotic enteritis” means the C. perfringens infections and/or the necrotic enteritis is reduced or completely eliminated.

Direct Fed Microbial: The term “direct fed microbial” means live micro-organisms including spores which, when administered in adequate amounts, confer a benefit, such as improved digestion or health, on the host.

Enzymatic activity under aerobic conditions: The term “enzymatic activity under aerobic conditions” means that the polypeptides produced by a Bacillus strain during growth under aerobic conditions have one of more enzyme activities. The substrates tested are amylose, arabinan, cellulose, casein, arabinoxylan and xylan and degradation of the substrate indicates amylase, arabinase, cellulase, protease or xylanase activity respectively. Such an assay is performed as described in Example 6.

Enzymatic activity under anaerobic conditions: The term “enzymatic activity under anaerobic conditions” means activity of enzymes produced by a Bacillus strain during growth under anaerobic conditions as described in Example 6.

European Production Efficacy Factor (EPEF): The European Production Efficacy Factor is a way of comparing the live-bird performance of flocks. This single-figure facilitates comparison of performance within and among farms and can be used to assess environmental, climatic and managemental variables. The EPEF is calculated as [(liveability (%)×Liveweight (kg))/(Age at depletion (days)×FCR)]×100, wherein livability is the percentage of birds alive at slaughter, Liveweight is the average weight of the birds at slaughter, age of depletion is the age of the birds at slaughter and FCR is the feed conversion ratio at slaughter.

Effective amount/concentration/dosage: The terms “effective amount”, “effective concentration”, or “effective dosage” are defined as the amount, concentration, or dosage of the bacterial strain(s) sufficient to improve the digestion or yield of an animal. The actual effective dosage in absolute numbers depends on factors including: the state of health of the animal in question, other ingredients present. The “effective amount”, “effective concentration”, or “effective dosage” of the bacterial strains may be determined by routine assays known to those skilled in the art. An example of an effective amount for poultry is given in Example 7.

FCR (Feed Conversion Rate): FCR is a measure of an animal's efficiency in converting feed mass into increases of the desired output. Animals raised for meat—such as swine, poultry and fish—the output is the mass gained by the animal. Specifically FCR is the mass of the food eaten divided by the output, all over a specified period. FCR can be determined as described in Example 8. Improvement in FCR means reduction of the FCR value. A FCR improvement of 2% means that the FCR was reduced by 2%.

Feeding an animal: The terms “feeding an animal” or “fed to an animal” means that the composition of the present invention is administered orally to the animal one or more times in an effective amount. The oral administration is typically repeated, e.g., one or more times daily over a specified time period such as several days, one week, several weeks, one months or several months. Feeding of poultry can, e.g., be performed as described in Example 7. Accordingly, the terms “feeding” or “fed” mean any type of oral administration such as administration via an animal feed or via drinking water.

Forage: The term “forage” as defined herein also includes roughage. Forage is fresh plant material such as hay and silage from forage plants, grass and other forage plants, seaweed, sprouted grains and legumes, or any combination thereof. Examples of forage plants are Alfalfa (lucerne), birdsfoot trefoil, brassica (e.g., kale, rapeseed (canola), rutabaga (swede), turnip), clover (e.g., alsike clover, red clover, subterranean clover, white clover), grass (e.g., Bermuda grass, brome, false oat grass, fescue, heath grass, meadow grasses, orchard grass, ryegrass, Timothy-grass), corn (maize), millet, barley, oats, rye, sorghum, soybeans and wheat and vegetables such as beets. Forage further includes crop residues from grain production (such as corn stover; straw from wheat, barley, oat, rye and other grains); residues from vegetables like beet tops; residues from oilseed production like stems and leaves form soy beans, rapeseed and other legumes; and fractions from the refining of grains for animal or human consumption or from fuel production or other industries.

Isolated: The term “isolated” means that the one or more bacterial strains described herein are in a form or environment which does not occur in nature, that is, the one or more bacterial strains are at least partially removed from one or more or all of the naturally occurring constituents with which it is associated in nature.

Non-hemolytic: Hemolysis is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify bacterial strains into hemolytic and non-hemolytic strains. In this context hemolysis is defined as described in EFSA Journal 2011; 9(11):2445, using Bacillus subtilis 168 (BGSC-1A1, Bacillus Genetic Stock Center) as a negative control. A Bacillus strain can be classified as non-hemolytic using the assay described in Example 1.

Pellet: The terms “pellet” and/or “pelleting” refer to solid rounded, spherical and/or cylindrical tablets or pellets and the processes for forming such solid shapes, particularly feed pellets and solid extruded animal feed. As used herein, the terms “extrusion” or “extruding” are terms well known in the art and refer to a process of forcing a composition, as described herein, through an orifice under pressure.

Poultry: The term “poultry” means domesticated birds kept by humans for the eggs they produce and/or their meat and/or their feathers. Poultry includes broilers and layers.

Poultry include members of the superorder Galloanserae (fowl), especially the order Galliformes (which includes chickens, Guineafowls, quails and turkeys) and the family Anatidae, in order Anseriformes, commonly known as “waterfowl” and including domestic ducks and domestic geese. Poultry also includes other birds that are killed for their meat, such as the young of pigeons. Examples of poultry include chickens (including layers, broilers and chicks), ducks, geese, pigeons, turkeys and quail.

Prevent C. perfringens infections and/or necrotic enteritis: The term “prevent C. perfringens infections and/or necrotic enteritis” means a method and/or composition that prevents development of a C. perfringens infection and/or necrotic enteritis in an animal.

Roughage: The term “roughage” means dry plant material with high levels of fiber, such as fiber, bran, husks from seeds and grains and crop residues (such as stover, copra, straw, chaff, sugar beet waste).

Sensitive to antibiotics: The term “sensitive to antibiotics” means the phenotypic property of a bacterial strain, that growth of said bacterial strain is inhibited under conditions where the bacterial strain would otherwise grow. In this context sensitivity to antibiotics is tested after the CLSI guidelines (M07-A9 Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria That Grow Aerobically; 2012). The S. aureus ATCC 29213 is used as reference strain, which means that it should be included in the test, and that the results are only valid if S. aureus ATCC 29213 show results in compliance with the breakpoints of the CLSI guideline (see example Table 5.5) (M100-S24 Performance Standards for Antimicrobial Susceptibility Testing; informational Supplement, 2014). A strain of Bacillus is considered sensitive if the growth is detected at or below the breakpoint concentration of the appropriate antibiotic specified in EFSA journal 2012; 10(6):2740.

Silage: The term “silage” means fermented, high-moisture stored fodder which can be fed to ruminants (cud-chewing animals such as cattle and sheep) or used as a biofuel feedstock for anaerobic digesters. It is fermented and stored in a process called ensilage, ensiling or silaging, and is usually made from grass or cereal crops (e.g., maize, sorghum, oats, rye, timothy etc. forage grass plants),) or legume crops like clovers/trefoils, alfalfa, vetches, using the entire green plant (not just the grain). Silage can be made from many field crops, and special terms may be used depending on type (oatlage for oats, haylage for alfalfa). Silage is made either by placing cut green vegetation in a silo, by piling it in a large heap covered with plastic sheet, or by wrapping large bales in plastic film.

Spore: The terms “spore” and “endospore” are interchangeable and have their normal meaning which is well known and understood by those of skill in the art. As used herein, the term spore refers to a microorganism in its dormant, protected state.

Stable: The term “stable” is a term that is known in the art, and in a preferred aspect, stable is intended to mean the ability of the microorganism to remain in a spore form until it is administered to an animal to improve the health of the animal.

Swine: The term “swine” or “pigs” means domesticated pigs kept by humans for food, such as their meat. Swine includes members of the genus Sus, such as Sus scrofa domesticus or Sus domesticus and include piglets, growing pigs, and sows.

Vegetable protein: The term “vegetable protein” refers to any compound, preparation or mixture that includes at least one protein derived from or originating from a vegetable, including modified proteins and protein-derivatives.

DETAILED DESCRIPTION OF THE INVENTION

It has been surprisingly found that the addition of direct fed microbes (DFM) from Bacillus species to animal feed can be used to prevent and/or control C. perfringens infections and/or necrotic enteritis in mono-gastric animal such as pigs and/or poultry and at the same time improve the body weight gain and/or feed conversion rate (e.g., in both C. perfringens challenged and unchallenged chickens).

Animal Feed and Animal Feed Additive According to the Invention

The invention relates to an animal feed or an animal feed additive comprising spores of one or more Bacillus strains according to invention. The spores are preferable stable spores.

More specifically the invention relates to the following aspects with respect to an animal feed or an animal feed additive comprising Bacillus strains:

Aspect 1: An animal feed or an animal feed additive comprising spores of a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.

Aspect 2: An animal feed or an animal feed additive comprising spores of a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline.

Aspect 3: An animal feed or an animal feed additive comprising spores of a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline and

iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.

Aspect 4: An animal feed or an animal feed additive comprising spores of a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain has enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan.

Sensitivity to Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline can, e.g., be determined as described in Example 5.

Enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan can, e.g., be determined as described in Example 6.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 2, 3 or 4 has enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1 or 3 improves one or more performance parameters in poultry selected from the list consisting of body weight gain, European Production Efficacy Factor and feed conversion rate in chickens fed with the Bacillus strain.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 4 has antimicrobial activity against Clostridium perfringens.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1 or 2 is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline.

In one embodiment the improvement of feed conversion rate (FCR) for the animal feed or the animal feed additive of Aspect 1, 2, 3 or 4 results in a FCR of −2.5% or less than −2.5%, such as less than −2.6%, such as less than −2.7%, such as less than −2.8%, such less than −2.9%, such as less than −3.0%. In a preferred embodiment the improvement of FCR results in a FCR of from −5% to −2% such as a FCR from −4% to −2%, such as a FCR of from −3.5% to −2.5%. In a specific embodiment the improvement of FCR for Aspect 1, 2, 3 or 4 results in a FCR within an interval selected from the group consisting of from −5% to −4.5%, from −4.5% to −4%, from −4% to −3.8%, from −3.8% to −3.6%, from −3.6% to −3.4%, from −3.4% to −3.2%, from −3.2 to −3.0%, from −3.0% to −2.8% and from −2.8 to −2.5%, or any combination of these intervals. The FCR can be determined as described in Example 8.

In one embodiment the improvement in body weight gain for the animal feed or the animal feed additive of Aspect 1, 2, 3 or 4 results in a body weight gain of at least 0.5%, such as at least 0.8%, such as at least 1.5%, such as at least 1.8%, such as at least 2.0%, such as at least 2.3%, such as at least 3.5%, such as at least 4.2%, such as at least 5.2%, such as at least 6.5%, such as at least 7.3%. In a preferred embodiment the improvement in body weight gain for Aspect 1, 2, 3 or 4 results in a body weight gain selected from the group consisting of from 1.8% to 2.0%, from 2.0% to 2.2%, from 2.2% to 2.4%, from 2.4% to 2.6%, from 2.6% to 2.8%, from 2.8% to 3.0%, from 3.0% to 3.2%, from 3.2% to 3.4%, from 3.4% to 3.6%, from 3.6% to 3.8%, from 3.8% to 4.0%, from 4% to 5%, from 5% to 7%, from 7% to 10%, or any combination thereof. The body weight gain can be determined as described in Example 8.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 wherein the Bacillus strain comprises 16S rDNA that is more than 98% (such as more than 98.5%, such as more than 99%, such as more than 99.5%) sequence identity to SEQ ID NO: 1 and/or more than 98% (such as more than 98.5%, such as more than 99%, such as more than 99.5%) sequence identity to SEQ ID NO: 2 and/or more than 98% (such as more than 98.5%, such as more than 99%, such as more than 99.5%) sequence identity to SEQ ID NO: 3 and/or more than 98% (such as more than 98.5%, such as more than 99%, such as more than 99.5%) sequence identity to SEQ ID NO: 4.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 embodiments has a high compatibility with monensin such as being compatible with at least 2.0 μg/ml monensin as determined in Example 12. It is even more preferred that the Bacillus strain is compatible with at least 2.4 μg/ml monensin as determined in Example 12 (such as at least 2.5 μg/ml monensin as determined in Example 12, such as at least 2.6 μg/ml monensin as determined in Example 12 or such as at least 2.7 μg/ml monensin as determined in Example 12).

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is a Bacillus subtilis strain, or a Bacillus amyloliquefaciens strain.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 has antimicrobial effect against E. coli. The effect against E. coli can, e.g., be determined as described in Example 4.

In one embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is the Bacillus strain having deposit accession number DSM 29869, or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. In another embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is the Bacillus strain having deposit accession number DSM 29870, or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. In yet another embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is the Bacillus strain having deposit accession number DSM 29871, or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. In a further embodiment the Bacillus strain of the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is the Bacillus strain having deposit accession number DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof that has antimicrobial activity against Clostridium perfringens.

The invention relates in one embodiment to an animal feed or an animal feed additive comprising a Bacillus having deposit accession number DSM 29869 or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof. The invention relates in another embodiment to an animal feed or an animal feed additive comprising a Bacillus having deposit accession number DSM 29870 or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof. The invention relates in another embodiment to an animal feed or an animal feed additive comprising a Bacillus having deposit accession number DSM 29871 or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof. The invention relates in a further embodiment to an animal feed or an animal feed additive comprising a Bacillus having deposit accession number DSM 29872 or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof.

In one embodiment of Aspect 1, 2, 3 or 4 the bacillus spores of the animal feed or the animal feed additive are present as dried spores. The animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 can also be a liquid composition and/or comprise culture supernatant comprising one or more Bacillus strain(s) of the invention.

In one embodiment of Aspect 1, 2, 3 or 4 the animal feed or the animal feed additive further comprises a carrier. The carrier can comprise one or more of the following compounds: water, glycerol, ethylene glycol, 1, 2-propylene glycol or 1, 3-propylene glycol, sodium chloride, sodium benzoate, potassium sorbate, sodium sulfate, potassium sulfate, magnesium sulfate, sodium thiosulfate, calcium carbonate, sodium citrate, dextrin, maltodextrin, glucose, sucrose, sorbitol, lactose, wheat flour, wheat bran, corn gluten meal, starch and cellulose.

In one embodiment the animal feed or the animal feed additive comprises one or more coccidiostats wherein the composition is, e.g., a premix.

In a preferred embodiment the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 comprises from 10⁵ to 10¹² CFU/g of isolated Bacillus spores.

In one embodiment the animal feed or animal feed additive is characterized in that at least 70% (such as at least 80% or at least 90%) of the Bacillus spores survive gastric stability in a mono-gastric animal such as chickens.

The animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 which further comprises one or more components selected from the list consisting of: one or more enzymes; one or more additional microbes; one or more vitamins; one or more minerals; one or more amino acids; and one or more other feed ingredients.

The animal feed according to Aspect 1, 2, 3 or 4 can be fed to an animal wherein the bacterial count of each Bacillus spore is between 1×10⁴ and 1×10¹⁴ CFU/kg of dry matter, preferably between 1×10⁶ and 1×10¹² CFU/kg of dry matter, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of dry matter. In a more preferred embodiment the bacterial count of each of the bacterial strains in the animal feed composition is between 1×10⁸ and 1×10¹⁰ CFU/kg of dry matter.

In a preferred embodiment, the bacterial count of each of the bacterial strains in the animal feed additive is between 1×10⁷ and 1×10¹⁸ CFU/kg of composition, preferably between 1×10⁹ and 1×10¹⁶ CFU/kg of composition, more preferably between 1×10¹⁰ and 1×10¹⁵ CFU/kg of composition and most preferably between 1×10¹¹ and 1×10¹⁴ CFU/kg of dry matter.

In a preferred embodiment the animal feed or the animal feed additive according to

Aspect 1, 2, 3 or 4 can be an animal feed or an animal feed additive wherein the bacterial count of each Bacillus spore is between 1×10³ and 1×10¹³ CFU/animal/day, preferably between 1×10 and 1×10¹¹ CFU/animal/day, and more preferably between 1×10⁶ and 1×10¹⁰ CFU/animal/day and even more preferably between 1×10⁷ and 1×10⁹ CFU/animal/day.

The animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 can be a mono-gastric animal feed. The mono-gastric animal can be selected from the group consisting of pigs, swine, piglets, sows, poultry, turkeys, ducks, chicken, broilers, layers, chicks, fish and crustaceans. In one embodiment the animal is not a human being. Mono-gastric animals include in one embodiment, but are not limited to, pigs or swine (including, but not limited to, piglets, growing pigs, and sows); poultry such as turkeys, ducks and chicken (including but not limited to broilers, chicks, layers); horses (including but not limited to hotbloods, coldbloods and warm bloods) and fish (including but not limited to salmon, trout, tilapia, catfish and carps; and crustaceans (including but not limited to shrimps and prawns). Pigs and/or poultry are preferred mono-gastric animals.

In a preferred embodiment the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is an animal feed or animal feed additive wherein the Bacillus strain improves gut health of chickens infected with Clostridium perfringens, e.g., by having antimicrobial activity against Clostridium perfringens.

In a preferred embodiment the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 is an animal feed or animal feed additive for treatment of necrotic enteritis or treatment of a Clostridium perfringens infection (e.g., for treatment of mono-gastric animals including swine and poultry such as chickens).

In a further embodiment, the animal feed or animal feed additive comprises one or more bacterial strains such as at least two of the above strains up to and including all of the strains in the group consisting of DSM 29869, DSM 29870, DSM 29871 and DSM 29872.

In an embodiment to any of the aforementioned embodiments the Bacillus spore kills/inhibits at least 40% (such as at least 45%, at least 50%, at least 60%, at least 70% or at least 80%) of Clostridium perfringens after, e.g., 24 hours, e.g., determined as described in Example 2.

In another embodiment of the invention the animal feed or animal feed additive further comprises concentrate. In another embodiment of the invention the animal feed or animal feed additive further comprises forage. In another embodiment of the invention the animal feed or animal feed additive such as the animal feed further comprises one or more additional microbes. In another embodiment of the invention the animal feed or animal feed additive further comprises one or more enzymes. In another embodiment of the invention the animal feed or animal feed additive further comprises one or more vitamins. In another embodiment of the invention the animal feed or animal feed additive further comprises one or more minerals. In another embodiment of the invention the animal feed or animal feed additive such as the animal feed further comprises one or more amino acids. In another embodiment of the invention the animal feed or animal feed additive further comprises one or more other feed ingredients.

In an embodiment to any of the aforementioned embodiments, the animal feed or the animal feed additive also improves the health of the mono-gastric animal when fed to said animal. In another embodiment to any of the aforementioned embodiments, the the animal feed or the animal feed additive also increases the egg yield of poultry when fed said poultry. In an embodiment to any of the aforementioned embodiments, the animal feed or the animal feed additive increases the meat yield of the mono-gastric animal when fed to said animal.

In a preferred embodiment, the animal feed comprises one or more bacterial strains described herein, wherein the bacterial count of each of the bacterial strains is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed. In a more preferred embodiment the bacterial count of each of the bacterial strains described herein is between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed.

In a preferred embodiment, the animal feed additive comprises one or more bacterial strains described herein, wherein the bacterial count of each of the bacterial strains is between 1×10⁷ and 1×10¹⁸ CFU/kg of animal feed additive, preferably between 1×10⁹ and 1×10¹⁶ CFU/kg of animal feed additive, and more preferably between 1×10¹⁰ and 1×10¹⁵ CFU/kg of animal feed additive. In a more preferred embodiment the bacterial count of each of the bacterial strains described herein is between 1×10¹¹ and 1×10¹⁴ CFU/kg of animal feed additive.

In a preferred embodiment, the bacterial count of each of the bacterial strains in the animal feed is between 1×10⁴ and 1×10¹⁴ CFU/kg of dry matter, preferably between 1×10⁶ and 1×10¹² CFU/kg of dry matter, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of dry matter. In a more preferred embodiment the bacterial count of each of the bacterial strains in the animal feed is between 1×10⁸ and 1×10¹⁰ CFU/kg of dry matter.

In a more preferred embodiment the animal feed or the animal feed additive according to Aspect 1, 2, 3 or 4 can be an animal feed or an animal feed additive wherein the bacterial count of each Bacillus spore is between 1×10³ and 1×10¹³ CFU/animal/day, preferably between 1×10⁵ and 1×10¹¹ CFU/animal/day, and more preferably between 1×10⁶ and 1×10¹⁰ CFU/animal/day and even more preferably between 1×10⁷ and 1×10⁹ CFU/animal/day.

In still yet another embodiment of the invention, the one or more bacterial strains are present in the animal feed or the animal feed additive in form of a spore such as a stable spore. In still a further embodiment of the invention, the stable spore will germinate in the intestine and/or stomach of the mono-gastric animal.

In one embodiment, the one or more bacterial strains are stable when subjected to pressures applied/achieved during an extrusion process for pelleting. In a particular embodiment, the one or more bacterial strains are stable at pressures ranging from 1 bar to 40 bar, particularly 10 bar to 40 bar, more particularly 15 bar to 40 bar, even more particularly 20 bar to 40 bar, still even more particularly 35 bar to 37 bar, even still more particularly 36 bar.

In a particular embodiment, the one or more bacterial strains are stable at high temperatures. In particular, the bacterial strains are stable when they are subjected to temperatures achieved during an extrusion process for pelleting. In an even more particular embodiment, the one or more bacterial strains are stable at temperatures ranging from 80° C. to 120° C., particularly temperatures ranging from, 90° C. to 120° C., even more particularly temperatures ranging from 95° C. to 120° C.

In another aspect, the invention relates to an animal feed or animal feed additive comprising a carrier, such as forage, and one or more of the bacteria cultures having characteristics substantially identical to that of a strain selected from the group consisting of:

the strain having the deposit accession number DSM 29869;

the strain having the deposit accession number DSM 29870;

the strain having the deposit accession number DSM 29871; and

the strain having the deposit accession number DSM 29872; or

any combination thereof.

In an embodiment, the animal feed or animal feed additive comprises a carrier and

the strain having the deposit accession number DSM 29869, or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof.

In an embodiment, the animal feed or animal feed additive comprises a carrier and the strain having the deposit accession number DSM 29870, or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof.

In an embodiment, the animal feed or animal feed additive comprises a carrier and the strain having the deposit accession number DSM 29871, or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof.

In an embodiment, the animal feed or animal feed additive comprises a carrier and the strain having the deposit accession number DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof.

In another embodiment, the animal feed or animal feed additive is for feeding to a mono-gastric animal. Mono-gastric animals include, but are not limited to, pigs or swine (including, but not limited to, piglets, growing pigs, and sows); poultry such as turkeys, ducks and chicken (including but not limited to broiler chicks, layers); horses (including but not limited to hotbloods, coldbloods and warm bloods) and fish (including but not limited to salmon, trout, tilapia, catfish and carps; and crustaceans (including but not limited to shrimps and prawns). Pigs and/or poultry are preferred mono-gastric animals.

In an embodiment, the animal feed or animal feed additive further comprises one or more additional microbes. In a particular embodiment, the animal feed further comprises a bacterium from one or more of the following genera: Lactobacillus, Lactococcus, Streptococcus, Bacillus, Pediococcus, Enterococcus, Leuconostoc, Carnobacterium, Propionibacterium, Bifidobacterium, Clostridium and Megasphaera or any combination thereof.

In a particular embodiment, animal feed or animal feed additive further comprises a bacterium from one or more of the following strains of Bacillus amyloliquefaciens, Bacillus subtilis, Bacillus pumilus, Bacillus polymyxa, Bacillus licheniformis, Bacillus megaterium, Bacillus coagulans, Bacillus circulans, or any combination thereof.

In a particular embodiment, the animal feed or animal feed additive further comprises one or more types of yeast. The one or more types of yeast can be selected from the group consisting of Saccharomycetaceae, Saccharomyces (such as S. cerevisiae and/or S. boulardii), Kluyveromyces (such as K. marxianus and K. lactis), Candida (such as C. utilis, also called Torula yeast), Pichia (such as P. pastoris), Torulaspora (such as T. delbrueckii), Phaffia yeasts and Basidiomycota.

In an embodiment to any of the aforementioned embodiments the animal feed or the animal feed additive further comprises a carrier. The carrier can comprise one or more of the following compounds: water, glycerol, ethylene glycol, 1, 2-propylene glycol or 1, 3-propylene glycol, sodium chloride, sodium benzoate, potassium sorbate, sodium sulfate, potassium sulfate, magnesium sulfate, sodium thiosulfate, calcium carbonate, sodium citrate, dextrin, maltodextrin, glucose, sucrose, sorbitol, lactose, wheat flour, wheat bran, corn gluten meal, starch and cellulose.

Animal Feed

In one aspect, the animal feed comprises the Bacillus strain according to Aspect 1, 2, 3 or 4 or the Bacillus strain having deposit accession number DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 or a mutant of DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 and further comprises one or more of concentrate(s), vitamin(s), mineral(s), enzyme(s), amino acid(s) and/or other feed ingredient(s). In a specific embodiment the animal feed further comprises forage.

Forage as defined herein also includes roughage. Forage is fresh plant material such as hay and silage from forage plants, grass and other forage plants, grass and other forage plants, seaweed, sprouted grains and legumes, or any combination thereof. Examples of forage plants are Alfalfa (lucerne), birdsfoot trefoil, brassica (e.g., kale, rapeseed (canola), rutabaga (swede), turnip), clover (e.g., alsike clover, red clover, subterranean clover, white clover), grass (e.g., Bermuda grass, brome, false oat grass, fescue, heath grass, meadow grasses, orchard grass, ryegrass, Timothy-grass), corn (maize), millet, barley, oats, rye, sorghum, soybeans and wheat and vegetables such as beets. Crops suitable for ensilage are the ordinary grasses, clovers, alfalfa, vetches, oats, rye and maize. Forage further includes crop residues from grain production (such as corn stover; straw from wheat, barley, oat, rye and other grains); residues from vegetables like beet tops; residues from oilseed production like stems and leaves form soy beans, rapeseed and other legumes; and fractions from the refining of grains for animal or human consumption or from fuel production or other industries.

Roughage is generally dry plant material with high levels of fiber, such as fiber, bran, husks from seeds and grains and crop residues (such as stover, copra, straw, chaff, sugar beet waste).

Examples of concentrates are feed with high protein and energy concentrations, such as fish meal, molasses, oligosaccharides, sorghum, seeds and grains (either whole or prepared by crushing, milling, etc. from, e.g., corn, oats, rye, barley, wheat), oilseed press cake (e.g., from cottonseed, safflower, sunflower, soybean (such as soybean meal), rapeseed/canola, peanut or groundnut), palm kernel cake, yeast derived material and distillers grains (such as wet distillers grains (WDS) and dried distillers grains with solubles (DDGS)).

In one embodiment, the forage and one or more microbes are mixed with a concentrate. In another embodiment, the forage and one or more microbes are mixed with a premix. In a further embodiment, the forage and one or more microbes are mixed with vitamins and/or minerals. In a further embodiment, the forage and one or more microbes are mixed with one or more enzymes. In a further embodiment, the forage and one or more microbes are mixed with other feed ingredients, such as colouring agents, stabilisers, growth improving additives and aroma compounds/flavorings, polyunsaturated fatty acids (PUFAs); reactive oxygen generating species, anti-microbial peptides, anti-fungal polypeptides and amino acids.

In particular embodiments, the animal feed may comprise Bacillus stain DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 or a strain having all of the identifying characteristics of Bacillus DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 or a mutant of DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 and 0-80% maize; and/or 0-80% sorghum; and/or 0-70% wheat; and/or 0-70% barley; and/or 0-30% oats; and/or 0-40% soybean meal; and/or 0-10% fish meal; and/or 0-20% whey.

The animal feed may comprise Bacillus stain DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 or a strain having all of the identifying characteristics of Bacillus DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 or a mutant of DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 and vegetable proteins. In particular embodiments, the protein content of the vegetable proteins is at least 10, 20, 30, 40, 50, 60, 70, 80, or 90% (w/w). Vegetable proteins may be derived from vegetable protein sources, such as legumes and cereals, for example, materials from plants of the families Fabaceae (Leguminosae), Cruciferaceae, Chenopodiaceae, and Poaceae, such as soy bean meal, lupin meal, rapeseed meal, and combinations thereof.

In a particular embodiment, the vegetable protein source is material from one or more plants of the family Fabaceae, e.g., soybean, lupine, pea, or bean. In another particular embodiment, the vegetable protein source is material from one or more plants of the family Chenopodiaceae, e.g., beet, sugar beet, spinach or quinoa. Other examples of vegetable protein sources are rapeseed, and cabbage. In another particular embodiment, soybean is a preferred vegetable protein source. Other examples of vegetable protein sources are cereals such as barley, wheat, rye, oat, maize (corn), rice, and sorghum.

In a particular embodiment the animal feed consists of or comprises milk (e.g., from sow), e.g., for feeding of piglets. In another particular embodiment the animal feed consists of or comprises milk replacement, e.g., for feeding of piglets.

Premix

In an embodiment, the animal feed may include a premix, comprising, e.g., vitamins, minerals, enzymes, preservatives, antibiotics, other feed ingredients or any combination thereof which are mixed into the animal feed.

In one aspect, the invention related to a premix for feeding an animal infected by Clostridium perfringens, the premix comprising at least the Bacillus strain DSM 29869 described above. In a further embodiment, the premix may comprise one or more bacterial strains, in addition to DSM 29869.

In one aspect, the invention related to a premix for feeding an animal infected by Clostridium perfringens, the premix comprising at least the Bacillus strain DSM 29870 described above. In a further embodiment, the premix may comprise one or more bacterial strains, in addition to DSM 29870.

In one aspect, the invention related to a premix for feeding an animal infected by Clostridium perfringens, the premix comprising at least the Bacillus strain DSM 29871 described above. In a further embodiment, the premix may comprise one or more bacterial strains, in addition to DSM 29871.

In one aspect, the invention related to a premix for feeding an animal infected by Clostridium perfringens, the premix comprising at least the Bacillus strain DSM 29872 described above. In a further embodiment, the premix may comprise one or more bacterial strains, in addition to DSM 29872.

Vitamins and Minerals

In another embodiment, the animal feed may include one or more vitamins, such as one or more fat-soluble vitamins and/or one or more water-soluble vitamins. In another embodiment, the animal feed may optionally include one or more minerals, such as one or more trace minerals and/or one or more macro minerals.

Usually fat- and water-soluble vitamins, as well as trace minerals form part of a so-called premix intended for addition to the feed, whereas macro minerals are usually separately added to the feed.

Non-limiting examples of fat-soluble vitamins include vitamin A, vitamin D3, vitamin E, and vitamin K, e.g., vitamin K3.

Non-limiting examples of water-soluble vitamins include vitamin B12, biotin and choline, vitamin B1, vitamin B2, vitamin B6, niacin, folic acid and panthothenate, e.g., Ca-D-panthothenate.

Non-limiting examples of trace minerals include boron, cobalt, chloride, chromium, copper, fluoride, iodine, iron, manganese, molybdenum, selenium and zinc.

Non-limiting examples of macro minerals include calcium, magnesium, potassium and sodium.

Enzymes

In another embodiment, the animal feed or animal feed additive described herein optionally include one or more enzymes. Enzymes can be classified on the basis of the handbook Enzyme Nomenclature from NC-IUBMB, 1992), see also the ENZYME site at the internet: expasy.ch/enzyme/. ENZYME is a repository of information relative to the nomenclature of enzymes. It is primarily based on the recommendations of the Nomenclature Committee of the International Union of Biochemistry and Molecular Biology (IUB-MB), Academic Press, Inc., 1992, and it describes each type of characterized enzyme for which an EC (Enzyme Commission) number has been provided (Bairoch, 2000, The ENZYME database, Nucleic Acids Res. 28:304-305). This IUB-MB Enzyme nomenclature is based on their substrate specificity and occasionally on their molecular mechanism; such a classification does not reflect the structural features of these enzymes.

Another classification of certain glycoside hydrolase enzymes, such as endoglucanase, xylanase, galactanase, mannanase, dextranase and alpha-galactosidase, in families based on amino acid sequence similarities has been proposed a few years ago. They currently fall into 90 different families: See the CAZy(ModO) internet site (Coutinho, P. M. & Henrissat, B. (1999) Carbohydrate-Active Enzymes server at URL: afmb.cnrs-mrs.fr/-cazy/CAZY/index.html (corresponding papers: Coutinho, P. M. & Henrissat, B. (1999) Carbohydrate-active enzymes: an integrated database approach. In “Recent Advances in Carbohydrate Bioengineering”, H. J. Gilbert, G. Davies, B. Henrissat and B. Svensson eds., The Royal Society of Chemistry, Cambridge, pp. 3-12; Coutinho, P. M. & Henrissat, B. (1999) The modular structure of cellulases and other carbohydrate-active enzymes: an integrated database approach. In “Genetics, Biochemistry and Ecology of Cellulose Degradation”., K. Ohmiya, K. Hayashi, K. Sakka, Y. Kobayashi, S. Karita and T. Kimura eds., Uni Publishers Co., Tokyo, pp. 15-23).

Thus the animal feed or animal feed additive of the invention may also comprise at least one other enzyme selected from the group comprising of phytase (EC 3.1.3.8 or 3.1.3.26); xylanase (EC 3.2.1.8); galactanase (EC 3.2.1.89); alpha-galactosidase (EC 3.2.1.22); protease (EC 3.4); phospholipase A1 (EC 3.1.1.32); phospholipase A2 (EC 3.1.1.4); lysophospholipase (EC 3.1.1.5); phospholipase C (3.1.4.3); phospholipase D (EC 3.1.4.4); amylase such as, for example, alpha-amylase (EC 3.2.1.1); lysozyme (EC 3.2.1.17); and beta-glucanase (EC 3.2.1.4 or EC 3.2.1.6), or any mixture thereof.

In a particular embodiment, the animal feed or animal feed additive of the invention comprises a phytase (EC 3.1.3.8 or 3.1.3.26). Examples of commercially available phytases include Bio-Feed™ Phytase (Novozymes), Ronozyme® P and HiPhos™ (DSM Nutritional Products), Natuphos™ (BASF), Finase® and Quantum® Blue (AB Enzymes), the Phyzyme® XP (Verenium/DuPont) and Axtra® PHY (DuPont). Other preferred phytases include those described in, e.g., WO 98/28408, WO 00/43503, and WO 03/066847.

In a particular embodiment, the animal feed or animal feed additive of the invention comprises a xylanase (EC 3.2.1.8). Examples of commercially available xylanases include Ronozyme® WX and G2 (DSM Nutritional Products), Econase® XT and Barley (AB Vista), Xylathin® (Verenium) and Axtra® XB (Xylanase/beta-glucanase, DuPont).

In a particular embodiment, the animal feed or animal feed additive of the invention comprises a protease (EC 3.4). Examples of commercially available proteases include Ronozyme® ProAct (DSM Nutritional Products).

Amino Acids

The animal feed or animal feed additive of the invention may further comprise one or more amino acids. Examples of amino acids which are used in animal feed are lysine, alanine, beta-alanine, threonine, methionine and tryptophan.

Other Feed Ingredients

The animal feed or animal feed additive of the invention may further comprise colouring agents, stabilisers, growth improving additives and aroma compounds/flavorings, polyunsaturated fatty acids (PUFAs); reactive oxygen generating species, anti-microbial peptides and anti-fungal polypeptides.

Examples of colouring agents are carotenoids such as beta-carotene, astaxanthin, and lutein.

Examples of aroma compounds/flavorings are creosol, anethol, deca-, undeca- and/or dodeca-lactones, ionones, irone, gingerol, piperidine, propylidene phatalide, butylidene phatalide, capsaicin and tannin.

Examples of antimicrobial peptides (AMP's) are CAP18, Leucocin A, Tritrpticin, Protegrin-1, Thanatin, Defensin, Lactoferrin, Lactoferricin, and Ovispirin such as Novispirin (Robert Lehrer, 2000), Plectasins, and Statins, including the compounds and polypeptides disclosed in WO 03/044049 and WO 03/048148, as well as variants or fragments of the above that retain antimicrobial activity.

Examples of antifungal polypeptides (AFP's) are the Aspergillus giganteus, and Aspergillus niger peptides, as well as variants and fragments thereof which retain antifungal activity, as disclosed in WO 94/01459 and WO 02/090384.

Examples of polyunsaturated fatty acids are C18, C20 and C22 polyunsaturated fatty acids, such as arachidonic acid, docosohexaenoic acid, eicosapentaenoic acid and gamma-linoleic acid.

Examples of reactive oxygen generating species are chemicals such as perborate, persulphate, or percarbonate; and enzymes such as an oxidase, an oxygenase or a syntethase.

The animal feed or animal feed additive of the invention may further comprise at least one amino acid. Examples of amino acids which are used in animal feed are lysine, alanine, beta-alanine, threonine, methionine and tryptophan.

Manufacturing

Animal diets can, e.g., be manufactured as mash feed (non-pelleted) or pelleted feed. Typically, the milled feed-stuffs are mixed and sufficient amounts of essential vitamins and minerals are added according to the specifications for the species in question. The bacteria cultures and optionally enzymes can be added as solid or liquid formulations. For example, for mash feed a solid or liquid culture formulation may be added before or during the ingredient mixing step. For pelleted feed the (liquid or solid) culture preparation may also be added before or during the feed ingredient step. Typically a liquid culture preparation comprises the culture of the invention optionally with a polyol, such as glycerol, ethylene glycol or propylene glycol, and is added after the pelleting step, such as by spraying the liquid formulation onto the pellets. The enzyme may also be incorporated in a feed additive or premix.

The enzyme may be added to the feed mix as a granule, which is optionally pelleted or extruded. The granule typically comprises a core particle and one or more coatings, which typically are salt and/or wax coatings. The core particle can either be a homogeneous blend of an active compound optionally together with salts (e.g., organic or inorganic zinc or calcium salt) or an inert particle with an active compound applied onto it. The active compound is the culture of the invention optionally combined with one or more enzymes. The inert particle may be water soluble or water insoluble, e.g., starch, a sugar (such as sucrose or lactose), or a salt (such as NaCl, Na₂SO₄). The salt coating is typically at least 1 μm thick and can either be one particular salt or a mixture of salts, such as Na₂SO₄, K₂SO₄, MgSO₄ and/or sodium citrate. Other examples are those described in, e.g., WO 2008/017659, WO 2006/034710, WO 97/05245, WO 98/54980, WO 98/55599, WO 2000/70034 or polymer coating such as described in WO 2001/00042.

Methods of Treatment of C. perfringens Infections and/or Necrotic Enteritis

In one embodiment, the invention relates to a method for treatment of C. perfringens infections and/or necrotic enteritis in an animal such as a mono-gastric animal including poultry using the animal feed or animal feed additive according to Aspect 1, 2, 3 or 4 (in an effective amount). In a specific embodiment the invention relates to a method for treatment of C. perfringens infections and/or necrotic enteritis in an animal such as an mono-gastric animal including poultry using an animal feed or animal feed additive comprising the Bacillus strain having deposit accession number DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 or a mutant of DSM 29869 and/or DSM 29870 and/or DSM 29871 and/or DSM 29872 (in an effective amount).

In one embodiment the animal is not a human being. In a further embodiment, the animal feed is fed to a mono-gastric animal. Mono-gastric animals include, but are not limited to, pigs or swine (including, but not limited to, piglets, growing pigs, and sows); poultry such as turkeys, ducks and chicken (including but not limited to broiler chicks, layers); horses (including but not limited to hotbloods, coldbloods and warm bloods) and fish (including but not limited to salmon, trout, tilapia, catfish and carps; and crustaceans (including but not limited to shrimps and prawns). Pigs and/or poultry are preferred mono-gastric animals.

The animal feed can further comprise one or more components selected from the list consisting of concentrate; forage; one or more enzymes; one or more additional microbes; one or more vitamins; one or more minerals; one or more amino acids; and one or more other feed ingredients.

In a further embodiment, the method comprises administrering to the animal feed one or more bacterial strains such as at least two of the above strains, at least three of the above strains, or up to and including all of the above strains.

In one embodiment, the method comprises administrering to the animal feed the Bacillus strains having the deposit accession number DSM 29869 or a strain having all the identifying characteristics of Bacillus DSM 29869 or a mutant thereof.

In one embodiment, the method comprises administering to the animal feed the Bacillus strains having the deposit accession number DSM 29870 or a strain having all the identifying characteristics of Bacillus DSM 29870 or a mutant thereof.

In one embodiment, the method comprises administering to the animal feed the Bacillus strains having the deposit accession number DSM 29871 or a strain having all the identifying characteristics of Bacillus DSM 29871 or a mutant thereof.

In one embodiment, the method comprises administering to the animal feed the Bacillus strains having the deposit accession number DSM 29872 or a strain having all the identifying characteristics of Bacillus DSM 29872 or a mutant thereof.

In another embodiment of the method, the animal feed further comprises concentrate. In another embodiment of the method, the animal feed further comprises forage. In another embodiment of the method, the animal feed further comprises one or more additional microbes. In another embodiment of the method, the animal feed further comprises one or more enzymes. In another embodiment of the method, the animal feed further comprises one or more vitamins. In another embodiment of the method, the animal feed further comprises one or more minerals. In another embodiment of the method, the animal feed further comprises one or more amino acids. In another embodiment of the method, the animal feed further comprises one or more other feed ingredients.

In an embodiment to any of the aforementioned embodiments, the method also improves the health of the mono-gastric animal feed. In another embodiment to any of the aforementioned embodiments, the method also increases the egg yield of poultry. In an embodiment to any of the aforementioned embodiments, the method also increases the meat yield of the mono-gastric animal.

In a preferred embodiment, the method comprises administering to a mono-gastric animal one or more bacterial strains described herein, wherein the bacterial count of each of the bacterial strains is between 1×10⁴ and 1×10¹⁴ CFU/kg of forage, preferably between 1×10⁶ and 1×10¹² CFU/kg of forage, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed. In a more preferred embodiment the bacterial count of each of the bacterial strains described herein is between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed.

In a preferred embodiment, the method comprises administering to a mono-gastric animal one or more bacterial strains described herein, wherein the bacterial count of each of the bacterial strains is between 1×10⁵ and 1×10¹⁵ CFU/animal/day, preferably between 1×10⁷ and 1×10¹³ CFU/animal/day, and more preferably between 1×10⁸ and 1×10¹² CFU/animal/day. In a more preferred embodiment the bacterial count of each of the bacterial strains described herein is between 1×10⁹ and 1×10¹¹ CFU/animal/day.

In another aspect, the invention covers the method for treatment of C. perfringens infections comprising:

(a) feeding a mono-gastric animal a feed; and

(b) administering to an animal one or more Bacillus strains selected from the group consisting of:

-   -   (i) the strain having the deposit accession number DSM 29869; or         a strain having all the identifying characteristics of Bacillus         DSM 29869 or a mutant thereof;     -   (ii) the strain having the deposit accession number DSM 29870;         or a strain having all the identifying characteristics of         Bacillus DSM 29870 or a mutant thereof;     -   (iii) the strain having the deposit accession number DSM 29871;         or a strain having all the identifying characteristics of         Bacillus DSM 29871 or a mutant thereof; and/or     -   (iv) the strain having the deposit accession number DSM 29872;         or a strain having all the identifying characteristics of         Bacillus DSM 29872 or a mutant thereof or any combination         thereof,     -   wherein the Bacillus strain antimicrobial activity against         Clostridium perfringens and/or E. coli, and wherein step (a)         occurs before, after, or simultaneously with step (b).

In a further embodiment, the method comprises administering to the animal feed one or more bacterial strains such as at least two of the above strains, at least three of the above strains, or up to and including all of the above strains.

In a preferred embodiment of the method, the animal feed is fed to a mono-gastric animal. In an embodiment of the method, the mono-gastric animal is, e.g., pigs or swine (including, but not limited to, piglets, growing pigs, and sows); poultry such as turkeys, ducks and chicken (including but not limited to broiler chicks, layers); horses (including but not limited to hotbloods, coldbloods and warm bloods), or fish (including but not limited to salmon, trout, tilapia, catfish and carps; and crustaceans (including but not limited to shrimps and prawns).

In another embodiment of the method, the animal feed further comprises one or more components selected from the list consisting of concentrate; forage; one or more enzymes; one or more additional microbes; one or more vitamins; one or more minerals; one or more amino acids; and one or more other feed ingredients.

In another embodiment of the method, the animal feed further comprises concentrate. In another embodiment of the method, the animal feed further comprises forage. In another embodiment of the method, the animal feed further comprises one or more additional microbes. In another embodiment of the method, the animal feed further comprises one or more enzymes. In another embodiment of the method, the animal feed further comprises one or more vitamins. In another embodiment of the method, the animal feed further comprises one or more minerals. In another embodiment of the method, the animal feed further comprises one or more amino acids. In another embodiment of the method, the animal feed further comprises one or more other feed ingredients.

In still yet another embodiment of the method, the one or more bacterial strains are present in the form of a stable spore. In still a further embodiment of the method, the stable spore will germinate in the intestine and/or stomach of the mono-gastric animal.

In a preferred embodiment, the method comprises administering to a mono-gastric animal one or more bacterial strains described herein, wherein the bacterial count of each of the bacterial strains is between 1×10⁴ and 1×10¹⁴ CFU/kg of forage, preferably between 1×10⁶ and 1×10¹² CFU/kg of forage, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of forage. In a more preferred embodiment the bacterial count of each of the bacterial strains described herein is between 1×10⁸ and 1×10¹⁰ CFU/kg of forage.

In a preferred embodiment, the method comprises administering to a mono-gastric animal one or more bacterial strains described herein, wherein the bacterial count of each of the bacterial strains is between 1×10⁵ and 1×10¹⁵ CFU/animal/day, preferably between 1×10⁷ and 1×10¹³ CFU/animal/day, and more preferably between 1×10⁸ and 1×10¹² CFU/animal/day. In a more preferred embodiment the bacterial count of each of the bacterial strains described herein is between 1×10⁹ and 1×10¹¹ CFU/animal/day.

In a preferred embodiment, the method comprises administering to a mono-gastric animal one or more bacterial strains described herein, wherein the bacterial count of each Bacillus spore is between 1×10⁵ and 1×10¹⁵ CFU/animal/day, preferably between 1×10⁷ and 1×10¹³ CFU/animal/day, and more preferably between 1×10⁸ and 1×10¹² CFU/animal/day.

The invention relates in a further embodiment to use of the animal feed or animal feed additive to improve the performance of an animal, such as improving the feed conversion rate and/or improving the European Production Efficacy Factor and/or improving the body weight gain and/or improving the feed efficiency and/or improving the health.

In one embodiment the improvement of feed conversion rate (FCR) for Aspect 1, 2, 3 or 4 results in a FCR of −2.5% or less than −2.5%, such as less than −2.6%, such as less than −2.7%, such as less than −2.8%, such less than −2.9%, such as less than −3.0%. In a preferred embodiment the improvement of FCR results in a FCR of from −5% to −2% such as a FCR from −4% to −2%, such as a FCR of from −3.5% to −2.5%. In a specific embodiment the improvement of FCR for Aspect 1, 2, 3 or 4 results in a FCR within an interval selected from the group consisting of from −5% to −4.5%, from −4.5% to −4%, from −4% to −3.8%, from −3.8% to −3.6%, from −3.6% to −3.4%, from −3.4% to −3.2%, from −3.2 to −3.0%, from −3.0% to −2.8% and from −2.8 to −2.5%, or any combination of these intervals. The FCR can be determined as described in Example 8.

In one embodiment the improvement in body weight gain for Aspect 1, 2, 3 or 4 results in a body weight gain of at least 0.5%, such as at least 0.8%, such as at least 1.5%, such as at least 1.8%, such as at least 2.0%, such as at least 2.3%, such as at least 3.5%, such as at least 4.2%, such as at least 5.2%, such as at least 6.5%, such as at least 7.3%. In a preferred embodiment the improvement in body weight gain for Aspect 1, 2, 3 or 4 results in a body weight gain selected from the group consisting of from 1.8% to 2.0%, from 2.0% to 2.2%, from 2.2% to 2.4%, from 2.4% to 2.6%, from 2.6% to 2.8%, from 2.8% to 3.0%, from 3.0% to 3.2%, from 3.2% to 3.4%, from 3.4% to 3.6%, from 3.6% to 3.8%, from 3.8% to 4.0%, from 4% to 5%, from 5% to 7%, from 7% to 10%, or any combination thereof. The body weight gain can be determined as described in Example 8.

Animal Feed and Animal Feed Additive Comprising Bacillus DSM 29870 and Use Thereof

The invention relates to the use of a feed or feed premix comprising at least the spores of a Bacillus subspecies to improve the performance of an animal infected by C. perfringens. More specifically the feed or feed premix described within the present comprise a Bacillus DSM 29870 (hereafter DSM 29870). This strain is characterized in that is non-hemolytic, has antimicrobial activity, e.g., against Clostridium perfringens and/or E. coli, is sensitive to Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline, improves body weight gain and/or feed conversion ratio in animal, hydrolyzes one or more of the substrates selected from the group consisting of amylase, arabinan, arabinoxylan, casein and xylan.

In an embodiment the present invention relates to the use of a feed or feed premix comprising at least the DSM 29870 as described above to improve the performance of an animal infected by C. perfringens. Within the meaning of the invention, “animal performance” may be determined by the body weight gain of the animal and/or by the feed conversion ratio and/or by the feed efficiency and/or by the digestibility of a nutrient in a feed (e.g., amino acid digestibility) and/or digestible energy or metabolizable energy in a feed and/or by nitrogen retention.

In a preferred embodiment of the invention “animal performance” is determined by the body weight gain of the animal and/or by the feed conversion ratio. By “improved animal performance” it is meant that there is increased body weight gain and/or reduced feed conversion ratio and/or improved digestibility of nutrients or energy in a feed and/or by improved nitrogen retention and/or increased feed efficiency resulting from the use of feed or feed premix of the present invention in feed in comparison to feed which does not comprise said feed or feed premix. Preferably, by “improved animal performance” it is meant that there is increased body weight gain and/or reduced feed conversion ratio.

In a preferred aspect of the invention, the animal feed or animal feed premix comprises at least the DSM 29870 bacterial strain described herein is used, wherein the bacterial count of the bacterial strains is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed or feed premix, preferably between 1×10⁶ and 1×10¹² CFU/kg of feed or feed premix, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of feed or feed premix. In a more preferred embodiment the bacterial count of the bacterial strains described herein is between 1×10⁸ and 1×1¹⁰ CFU/kg of feed or feed premix.

As used herein, the term “feed conversion ratio” refers to the amount of feed fed to an animal to increase the weight of the animal by a specified amount. Specifically FCR is the mass of the food eaten divided by the output, all over a specified period. FCR can be determined as described in the Examples. An improved feed conversion ratio means a lower feed conversion ratio. By “lower feed conversion ratio” or “improved feed conversion ratio” it is meant that the use of a feed additive composition in feed results in a lower amount of feed being required to be fed to an animal to increase the weight of the animal by a specified amount compared to the amount of feed required to increase the weight of the animal by the same amount when the feed does not comprise said feed additive composition. In one embodiment the improvement of feed conversion rate (FCR) for Aspect 5, 6, 7 or 8 results in a FCR of −2.5% or less than −2.5%, such as less than −2.6%, such as less than −2.7%, such as less than −2.8%, such less than −2.9%, such as less than −3.0%. In a preferred embodiment the improvement of FCR results in a FCR of from −5% to −2% such as a FCR from −4% to −2%, such as a FCR of from −3.5% to −2.5%. In a specific embodiment the improvement of FCR for Aspect 1, 2, 3 or 4 results in a FCR within an interval selected from the group consisting of from −5% to −4.5%, from −4.5% to −4%, from −4% to −3.8%, from −3.8% to −3.6%, from −3.6% to −3.4%, from −3.4% to −3.2%, from −3.2 to −3.0%, from −3.0% to −2.8% and from −2.8 to −2.5%, or any combination of these intervals.

An “increased body weight gain” refers to an animal having increased body weight on being fed feed comprising a feed composition compared with an animal being fed a feed without said feed composition of the invention. Specifically, the Body Weight Gain of an animal is the increase of body weight of the animal over a specified time period. In one embodiment, the improvement in body weight gain if of at least 0.5% such at least 1%, such at least 2%, such at least 2.3%, such at least 3%, such at least 4%, such at least 5%, such at least 6%, such at least 6.5%, such at least 7%, such at least 8%, such at least 8%, such at least 10%. In one embodiment the improvement in body weight gain for Aspect 5, 6, 7 or 8 results in a body weight gain of at least 0.5%, such as at least 0.8%, such as at least 1.5%, such as at least 1.8%, such as at least 2.0%, such as at least 2.3%, such as at least %, such as at least 4.2%, such as at least 5.2%, such as at least 6.5%, such as at least 7.3%. In a preferred embodiment the improvement in body weight gain for Aspect 1, 2, 3 or 4 results in a body weight gain selected from the group consisting of from 1.8% to 2.0%, from 2.0% to 2.2%, from 2.2% to 2.4%, from 2.4% to 2.6%, from 2.6% to 2.8%, from 2.8% to 3.0%, from 3.0% to 3.2%, from 3.2% to 3.4%, from 3.4% to 3.6%, from 3.6% to 3.8%, from 3.8% to 4.0%, from 4% to 5%, from 5% to 7%, from 7% to 10%, or any combination thereof.

As used herein, the term “feed efficiency” refers to the amount of weight gain in an animal that occurs when the animal is fed ad-libitum or a specified amount of food during a period of time. By “increased feed efficiency” it is meant that the use of the feed or the feed premix according the present invention in feed results in an increased weight gain per unit of feed intake compared with an animal fed without said feed or feed premix being present.

Nutrient digestibility as used herein means the fraction of a nutrient that disappears from the gastro-intestinal tract or a specified segment of the gastro-intestinal tract, e.g., the small intestine. Nutrient digestibility may be measured as the difference between what is administered to the subject and what comes out in the faeces of the subject, or between what is administered to the subject and what remains in the digesta on a specified segment of the gastro intestinal tract, e.g., the ileum. Nutrient digestibility as used herein may be measured by the difference between the intake of a nutrient and the excreted nutrient by means of the total collection of excreta during a period of time; or with the use of an inert marker that is not absorbed by the animal, and allows the researcher calculating the amount of nutrient that disappeared in the entire gastro-intestinal tract or a segment of the gastro-intestinal tract. Such an inert marker may be titanium dioxide, chromic oxide or acid insoluble ash. Digestibility may be expressed as a percentage of the nutrient in the feed, or as mass units of digestible nutrient per mass units of nutrient in the feed. Nutrient digestibility as used herein encompasses starch digestibility, fat digestibility, protein digestibility, mineral digestibility and amino acid digestibility.

Energy digestibility as used herein means the gross energy of the feed consumed minus the gross energy of the faeces or the gross energy of the feed consumed minus the gross energy of the remaining digesta on a specified segment of the gastro-intestinal tract of the animal, e.g., the ileum. Metabolizable energy as used herein refers to apparent metabolizable energy and means the gross energy of the feed consumed minus the gross energy contained in the faeces, urine, and gaseous products of digestion. Energy digestibility and metabolizable energy may be measured as the difference between the intake of gross energy and the gross energy excreted in the faeces or the digesta present in specified segment of the gastro-intestinal tract using the same methods to measure the digestibility of nutrients, with appropriate corrections for nitrogen excretion to calculate metabolizable energy of feed.

Nitrogen retention as used herein means a subject's ability to retain nitrogen from the diet as body mass. A negative nitrogen balance occurs when the excretion of nitrogen exceeds the daily intake and is often seen when the muscle is being lost. A positive nitrogen balance is often associated with muscle growth, particularly in growing animals. Nitrogen retention may be measured as the difference between the intake of nitrogen and the excreted nitrogen by means of the total collection of excreta and urine during a period of time. It is understood that excreted nitrogen includes undigested protein from the feed, endogenous proteinaceous secretions, microbial protein, and urinary nitrogen.

Method for Improving the Performance of an Animal Using Bacillus Strain DSM 29870

In another aspect the present invention relates to a method for improving the performance of an animal infected by C. perfringens comprising the step of administering to said animal a feed or feed premix comprising at least the Bacillus strain DSM 29870.

In a preferred aspect of the invention, the feed or feed premix comprises at least the DSMZ 29870 bacterial strain, wherein the bacterial count of each of the bacterial strains is between 1×10⁴ and 1×10¹⁴ CFU/kg of feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of feed. In a more preferred embodiment the bacterial count of the bacterial strains described herein is between 1×10⁸ and 1×10¹⁰ CFU/kg of feed. Within the meaning of the invention, the terms “improving animal performance” are defined as above in the paragraph “use of the composition”. In a specific embodiment, the invention deals with a method for improving the body weight gain and/or the feed conversion ratio of an animal infected by C. perfringens comprising the step of administering to said animal a feed composition comprising at least the Bacillus strain DSM 29870. As indicated above the animal is selected from the group consisting of swine and poultry. More specifically, the animal is selected from the group comprising chickens, broilers, layers, quails and turkey, domestic ducks or domestic geese or the young of pigeons, pigs, swine, piglets, growing pigs, or sows

Method for Feeding an Animal Using Bacillus Strain DSM 29870

In another aspect the present invention relates to a method for feeding an animal infected by C. perfringens comprising administering a feed or feed premix comprising at least the Bacillus strain DSM29870 to said animal optionally in conjunction with other animal feed ingredients.

Within the meaning of the invention, the terms “improving animal performance” are defined as above. As indicated above the animal is selected from the group consisting of swine and poultry. More specifically, the animal is selected from the group comprising chickens, broilers, layers, quails and turkey, domestic ducks or domestic geese or the young of pigeons, pigs, swine, piglets, growing pigs, or sows. In a preferred aspect of the invention, the composition such as a feed comprises at least the DSMZ 29870 bacterial strain, wherein the bacterial count of each of the bacterial strains is between 1×10⁴ and 1×10¹⁴ CFU/kg of feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of feed. In a more preferred embodiment the bacterial count of the bacterial strains described herein is between 1×10⁸ and 1×10¹⁰ CFU/kg of feed. The following examples are provided to better illustrate the claimed invention and are not to be interpreted as limiting the scope of the invention. To the extent that specific materials are mentioned, it is merely for purposes of illustration and is not intended to limit the invention. One skilled in the art may develop equivalent means or reactants without the exercise of inventive capacity and without departing from the scope of the invention.

Preferred Embodiments

Preferred embodiments of the invention are described in the set of items herein below (cf. ITEM SET I, ITEM SET II and ITEM SET III).

Item Set I:

1. An animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.

2. An animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline.

3. An animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline and

iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.

4. An animal feed or an animal feed additive comprising a Bacillus strain characterized in that:

i) the Bacillus strain is non-hemolytic,

ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens and

iii) the Bacillus strain has enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan.

5. The animal feed or the animal feed additive according to any of items 1 to 3, wherein the Bacillus strain has enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan, e.g., as determined in Example 6. 6. The animal feed or the animal feed additive according to any of items 1 and 4, wherein the Bacillus strain improves one or more performance parameters in poultry selected from the list consisting of body weight gain, European Production Efficacy Factor and feed conversion rate in poultry fed with the Bacillus strain. 7. The animal feed or the animal feed additive according to item 3, wherein the Bacillus strain has antimicrobial activity against Clostridium perfringens, e.g., as determined in Example 2. 8. The animal feed or the animal feed additive according to any of items 1 and 4, wherein the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline, e.g., as determined in Example 5. 9. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain comprises 16S rDNA that has more than 98% sequence identity to SEQ ID NO: 1 and/or more than 98% sequence identity to SEQ ID NO: 2 and/or more than 98% sequence identity to SEQ ID NO: 3 and/or more than 98% sequence identity to SEQ ID NO: 4. 10. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is a Bacillus subtilis strain or a Bacillus amyloliquefaciens strain. 11. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain has antimicrobial effect against E. coli, e.g., as determined in Example 4. 12. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29869, or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 13. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29870, or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 14. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29871, or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 15. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 16. The animal feed or the animal feed additive according to any of items 1 to 15, wherein the Bacillus spores of the animal feed or the animal feed additive are present as dried spores. 17. The animal feed or the animal feed additive according to any of items 1 to 16 which further comprises a carrier. 18. The animal feed or the animal feed additive according to item 17, wherein the carrier comprises one or more of the following compounds: water, glycerol, ethylene glycol, 1, 2-propylene glycol or 1, 3-propylene glycol, sodium chloride, sodium benzoate, potassium sorbate, sodium sulfate, potassium sulfate, magnesium sulfate, sodium thiosulfate, calcium carbonate, sodium citrate, dextrin, maltodextrin, glucose, sucrose, sorbitol, lactose, wheat flour, wheat bran, corn gluten meal, starch and cellulose. 19. The animal feed or the animal feed additive according to any of items 1 to 18, wherein the animal feed or animal feed additive comprises from 10⁵ to 10¹² CFU/g of isolated Bacillus spores. 20. The animal feed or animal feed additive of any of items 1 to 19, wherein at least 70% (such as at least 80% or at least 90%) of the Bacillus spores survive gastric stability in a mono-gastric animal such as chickens. 21. The animal feed or animal feed additive according to any of items 1 to 20 which further comprises one or more components selected from the list consisting of:

-   -   one or more enzymes;     -   one or more additional microbes;     -   one or more vitamins;     -   one or more minerals;     -   one or more amino acids; and one or more other feed ingredients.         22. The animal feed or animal feed additive according to any of         items 1 to 21, wherein the bacterial count of each Bacillus         spore is 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed or animal feed         additive, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal         feed or animal feed additive, and more preferably between 1×10⁷         and 1×10¹¹ CFU/kg of animal feed or animal feed additive.         23. The animal feed or animal feed additive according to any of         items 1 to 22, wherein the animal feed or animal feed additive         is a mono-gastric animal feed or animal feed additive.         24. The animal feed or animal feed additive according to any of         items 1 to 23, wherein the Bacillus strain improves gut health         of chickens with infection of Clostridium perfringens by having         antimicrobial activity against Clostridium perfringens.         25. The mono-gastric animal feed or animal feed additive         according to item 24, wherein the mono-gastric animal is         selected from the group consisting of pigs, swine, piglets,         sows, poultry, turkeys, ducks, chicken, broilers, layers,         chicks, fish and crustaceans.         26. The animal feed or animal feed additive according to any of         items 1 to 25, wherein the Bacillus strain has a high         compatibility with monensin such as being compatible with at         least 2.0 μg/ml monensin, e.g., as determined in Example 12         (such as at least 2.1 μg/ml monensin, such as at least 2.2 μg/ml         monensin, such as at least 2.3 μg/ml monensin, such as at least         2.4 μg/ml monensin, such as at least 2.5 μg/ml monensin, such as         at least 2.6 μg/ml monensin or such as at least 2.7 μg/ml         monensin as determined in Example 12).         27. An animal feed or animal feed additive according to any of         items 1 to 26 for the treatment of necrotic enteritis or the         treatment of a Clostridium perfringens infection.         28. The animal feed or animal feed additive according to item 27         for treatment of mono-gastric animals.         29. A method of treating a Clostridium perfringens infection or         for treating necrotic enteritis in an animal comprising         administrating the animal feed or the animal feed additive         according to any of items 1 to 28 to the animal.         30. Use of the animal feed or the animal feed additive according         to any of items 1 to 28 to treat a Clostridium perfringens         infection or for treating necrotic enteritis in an animal.         31. Use of the animal feed or the animal feed additive according         to any of items 1 to 28 to improve one or more performance         parameters of an animal selected from the group consisting of:         improving the feed conversion ratio, improving the body weight         gain, improving the European Production Efficacy Factor,         improving the feed efficiency and improving the health.         32. A method of improving one or more performance parameters of         an animal selected from the group consisting of: improving the         feed conversion ratio, improving the body weight gain, improving         the European Production Efficacy Factor, improving the feed         efficiency and improving the health, comprising administering         the animal feed or animal feed additive according to any of         items 1 to 28 to the animal.

Item Set II:

1. Use of an animal feed or an animal feed premix comprising at least the Bacillus strain DSM 29870 for improving the performance of an animal. 2. The use of the animal feed or the animal feed premix comprising at least the Bacillus strain DSM 29870 according to item 1 for improving the feed conversion ratio and/or for improving the body weight gain and/or for improving the feed efficiency, and/or the weight, and/or the feed intake. 3. The use of the animal feed or the animal feed premix comprising at least the Bacillus strain DSM 29870 according to item 1 or 2 wherein the animal is selected from the group consisting of poultry and swine. 4. The use of the animal feed or the animal feed premix comprising at least the Bacillus strain DSM 29870 according to item 3 wherein the animal is selected from chickens, broilers, layers, quails and turkey, domestic ducks or domestic geese or the young of pigeons, pigs, swine, piglets, growing pigs, or sows. 5. Use of the animal feed or the animal feed additive according to anyone of items 1 to 4 wherein the composition is a feed composition such an animal feed or a premix. 6. Use of the animal feed according to any of item 1 to 4 wherein the feed comprises at least the DSM 29870 Bacillus strain and wherein the bacterial count of each bacterial strain is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed and even more preferably between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed. 7. A method for improving the performance of an animal comprising administering to said animal an animal feed or an animal feed premix comprising at least the Bacillus strain DSM29870. 8. The method for improving the performance of an animal according to item 7 such as improving the feed conversion ratio and/or improving the body weight gain and/or improving the feed efficiency, and/or the weight, and/or improving feed intake. 9. The method for improving the performance of an animal according to item 7 or 8 wherein the animal is selected from the group consisting of poultry and swine. 10. The method for improving the performance of an animal according to item 9 wherein the animal is selected from the group comprising chickens, broilers, layers, quails and turkey, domestic ducks or domestic geese or the young of pigeons, pigs, swine, piglets, growing pigs, or sows. 11. A method for improving the performance of an animal according to anyone of the items 7 to 10 wherein the bacterial count of each bacterial strain is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed and even more preferably between 1×10⁸ and xl 010 CFU/kg of animal feed. 12. A method for feeding an animal comprising administering an animal feed or an animal feed premix comprising at least the Bacillus strain DSM 29870 to said animal optionally in conjunction with other animal feed ingredients. 13. The method for feeding an animal according to item 12 wherein the animal is selected from the group consisting of poultry and swine. 14. The method for feeding an animal according to item 13 wherein the animal is selected from the group comprising chickens, broilers, layers, quails and turkey, domestic ducks or domestic geese or the young of pigeons, pigs, swine, piglets, growing pigs, or sows. 15. A method for feeding an animal according to anyone of items 12 to 14 wherein the bacterial count of each bacterial strain is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed and even more preferably between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed. 16. A feed or a feed premix for improving the performance of poultries and swine comprising at least the Bacillus strain DSM 29870. 17. The feed or feed premix according to item 16 further comprising one or more enzymes; one or more additional microbes; one or more vitamins; one or more minerals; one or more amino acids; and one or more other feed or feed premix ingredients. 18. The feed according to item 16 or 17 wherein the bacterial count of each bacterial strain is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed and even more preferably between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed.

Item Set III:

1. An animal feed or an animal feed additive comprising a Bacillus strain selected from the group consisting of

a Bacillus strain having deposit accession number DSM 29870, or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof that has antimicrobial activity against Clostridium perfringens;

a Bacillus strain having deposit accession number DSM 29869, or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof that has antimicrobial activity against Clostridium perfringens;

a Bacillus strain having deposit accession number DSM 29871, or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof that has antimicrobial activity against Clostridium perfringens; and a Bacillus strain having deposit accession number DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof that has antimicrobial activity against Clostridium perfringens.

2. The animal feed or the animal feed additive according to item 1, wherein the Bacillus strain comprises 16S rDNA that has more than 98% sequence identity to SEQ ID NO: 1 and/or more than 98% sequence identity to SEQ ID NO: 2 and/or more than 98% sequence identity to SEQ ID NO: 3 and/or more than 98% sequence identity to SEQ ID NO: 4. 3. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that: i) the Bacillus strain is non-hemolytic and/or, ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens, and/or iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain. 4. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that the Bacillus strain is sensitive to at least seven such as eight of the antibiotics selected from the group consisting of Vancomycin, Clindamycin, Chloramphenicol, Gentamicin, Kanamycin, Streptomycin, Erythromycin and Tetracycline, e.g., as determined in Example 5. 5. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that the Bacillus strain is non-hemolytic 6. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain. 7. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that the Bacillus strain has antimicrobial activity against Clostridium perfringens, e.g., as determined in Example 2. 8. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that the Bacillus strain has enzymatic activity under aerobic and/or anaerobic conditions that hydrolyzes one or more of the substrates selected from the group consisting of Amylose, Arabinan, Arabinoxylan, Casein and Xylan, e.g., as determined in Example 6. 9. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is characterized in that the Bacillus strain improves one or more performance parameters in poultry selected from the list consisting of body weight gain, European Production Efficacy Factor and feed conversion rate in poultry fed with the Bacillus strain. 10. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain comprises 16S rDNA that has more than 99% sequence identity to SEQ ID NO: 1 and/or more than 99% sequence identity to SEQ ID NO: 2 and/or more than 99% sequence identity to SEQ ID NO: 3 and/or more than 99% sequence identity to SEQ ID NO: 4. 11. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is a Bacillus subtilis strain or a Bacillus amyloliquefaciens strain. 12. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain has antimicrobial effect against E. coli, e.g., as determined in Example 4. 13. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29869, or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 14. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29870, or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 15. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29871, or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 16. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus strain is the Bacillus strain having deposit accession number DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof that has antimicrobial activity against Clostridium perfringens. 17. The animal feed or the animal feed additive according to any of the previous items, wherein the Bacillus spores of the animal feed or the animal feed additive are present as dried spores such as spray dried spores. 18. The animal feed or the animal feed additive according to any of the previous items, wherein the animal feed or animal feed additive comprises from 10⁵ to 10¹² CFU/g of isolated Bacillus spores. 19. The animal feed or animal feed additive of any of the previous items, wherein at least 70% (such as at least 80% or at least 90%) of the Bacillus spores survive gastric stability in a mono-gastric animal such as chickens. 20. The animal feed or animal feed additive according to any of the previous items which further comprises one or more components selected from the list consisting of:

-   -   one or more enzymes;     -   one or more additional microbes;     -   one or more vitamins;     -   one or more minerals;     -   one or more amino acids; and     -   one or more other feed ingredients.         21. The animal feed or animal feed additive according to any of         the previous items, wherein the bacterial count of each Bacillus         spore is 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed or animal feed         additive, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal         feed or animal feed additive, and more preferably between 1×10⁷         and 1×10¹¹ CFU/kg of animal feed or animal feed additive.         22. The animal feed or animal feed additive according to any of         the previous items, wherein the animal feed or animal feed         additive is a mono-gastric animal feed or mono-gastric animal         feed additive.         23. The animal feed or animal feed additive according to any of         the previous items, wherein the Bacillus strain improves gut         health of chickens with infection of Clostridium perfringens by         having antimicrobial activity against Clostridium perfringens.         24. The mono-gastric animal feed or animal feed additive         according to item 22 or 23, wherein the mono-gastric animal is         selected from the group consisting of pigs, swine, piglets,         sows, poultry, turkeys, ducks, chicken, broilers, layers,         chicks, fish and crustaceans.         25. The animal feed or animal feed additive according to any of         the previous items, wherein the Bacillus strain has a high         compatibility with monensin such as being compatible with at         least 2.0 μg/ml monensin, e.g., as determined in Example 12         (such as at least 2.1 μg/ml monensin, such as at least 2.2 μg/ml         monensin, such as at least 2.3 μg/ml monensin, such as at least         2.4 μg/ml monensin, such as at least 2.5 μg/ml monensin, such as         at least 2.6 μg/ml monensin or such as at least 2.7 μg/ml         monensin as determined in Example 12).         26. The animal feed or the animal feed additive according to any         of the previous items which further comprises a carrier.         27. The animal feed or the animal feed additive according to         item 26, wherein the carrier comprises one or more of the         following compounds: water, glycerol, ethylene glycol, 1,         2-propylene glycol or 1, 3-propylene glycol, sodium chloride,         sodium benzoate, potassium sorbate, sodium sulfate, potassium         sulfate, magnesium sulfate, sodium thiosulfate, calcium         carbonate, sodium citrate, dextrin, maltodextrin, glucose,         sucrose, sorbitol, lactose, wheat flour, wheat bran, corn gluten         meal, starch and cellulose.         28. The animal feed or animal feed additive according to any of         the previous items for the treatment of necrotic enteritis         and/or the treatment of a Clostridium perfringens infection.         29. The animal feed or animal feed additive according to any of         the previous items comprising at least the Bacillus strain DSM         29870.         30. The animal feed or animal feed additive according to any of         the previous items comprising at least the Bacillus strain DSM         29869.         31. The animal feed or animal feed additive according to any of         the previous items comprising at least the Bacillus strain DSM         29871.         32. The animal feed or animal feed additive according to any of         the previous items comprising at least the Bacillus strain DSM         29872.         33. The animal feed or animal feed additive according to any of         the previous items for treatment of mono-gastric animals.         34. A method of treating a Clostridium perfringens infection or         for treating necrotic enteritis in an animal comprising         administrating the animal feed or the animal feed additive         according to any of items 1 to 33 to the animal.         35. Use of the animal feed or the animal feed additive according         to any of items 1 to 33 to treat a Clostridium perfringens         infection or for treating necrotic enteritis in an animal.         36. Use of the animal feed or the animal feed additive according         to any of items 1 to 33 to improve one or more performance         parameters of an animal selected from the group consisting of:         improving the feed conversion ratio, improving the body weight         gain, improving the European Production Efficacy Factor,         improving the feed efficiency and improving the health.         37. The use according to item 35 or 36, wherein the animal feed         or the animal feed additive comprises the Bacillus strain DSM         29870.         38. A method of improving one or more performance parameters of         an animal selected from the group consisting of: improving the         feed conversion ratio, improving the body weight gain, improving         the European Production Efficacy Factor, improving the feed         efficiency and improving the health, comprising administering         the animal feed or animal feed additive according to any of         items 1 to 33 to the animal.         39. The method according to item 38, wherein the animal feed or         the animal feed additive comprises the Bacillus strain DSM         29870.         40. A method for feeding an animal comprising administering an         animal feed or an animal feed premix comprising at least the         Bacillus strain DSM 29870 to said animal optionally in         conjunction with other animal feed ingredients.         41. The method for feeding an animal according to item 40         wherein the animal is selected from the group consisting of         poultry and swine.         42. A feed or a feed premix for improving the performance of         poultries and swine comprising at least the Bacillus strain DSM         29870.         43. The feed, feed additive or feed premix according to any of         items 1 to 33 and item 42 wherein the bacterial count of each         bacterial strain is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal         feed (or per kg of feed additive or per kg of feed premix),         preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed (or         per kg of feed additive or per kg of feed premix), and more         preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed (or         per kg of feed additive or per kg of feed premix) and even more         preferably between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed (or         per kg of feed additive or per kg of feed premix).         44. The feed according to any of items 1 to 33 and item 42         wherein the bacterial count of each bacterial strain is between         1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶         and 1×10¹² CFU/kg of animal feed, and more preferably between         1×10⁷ and 1×10¹¹ CFU/kg of animal feed and even more preferably         between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed.         45. The feed additive or feed premix according to any of items 1         to 33 and item 42 wherein the bacterial count of each bacterial         strain is between 1×10⁷ and 1×10¹⁹ CFU/kg of animal feed         additive or kg of feed premix, preferably between 1×10⁹ and         1×10¹⁷ CFU/kg of animal feed additive or kg of feed premix, and         more preferably between 1×10¹⁰ and 1×10¹⁶ CFU/kg of animal feed         additive or kg of feed premix and even more preferably between         1×10¹¹ and 1×10¹⁵ CFU/kg of animal feed additive or kg of feed         premix.

EXAMPLES Example 1: Screening for Hemolysis Negative Bacillus Strains

Hemolysis was tested according to the Technical Guidance on the assessment of the toxigenic potential of Bacillus species used in animal nutrition, EFSA Journal 2011; 9(11):2445.

Sheep blood agar plates were purchased as ready to use (Becton Dickenson art 254053 or 254087). Alternatively, the agar plates can be prepared by adding 5% defibrinated sheep blood (obtained from Statens Serum Institute, Denmark) to TS-agar (Oxoid CM 131). Agar should be autoclaved at 121° C. for 20 minutes and cooled down to about 40° C. before adding the blood immediately before pouring the plates.

The Bacillus strains were taken from the preservation at −80° C. and streaked on TS-agar plate, which was incubated at 30° C. overnight or until growth appeared. From a single colony as little as possible of the material was used to streak a line on % of an agar plate. The plate was incubated at 30° C. for 72 hours. Hemolysis/clearing zones of the Bacillus strains to be tested were compared with the positive and negative control. As positive control Bacillus subtilis ATCC 21332 was used. As negative control Bacillus subtilis 168 (BGSC-1A1, Bacillus Genetic Stock Center) was used.

In a screening of 599 independent isolates of Bacillus 223 strains (37%) were hemolysis negative. In another screening 21 of 65 independent isolates of Bacillus (32%) were hemolysis negative. Both screenings exclusively comprised strains that based on identification by 16S rDNA sequencing belong to Bacillus subtilis, Bacillus licheniformis, Bacillus pumilus or Bacillus amyloliquefaciens or close relatives to these four species.

The non-Hemolytic Bacillus strains therefore seem to be common and fairly abundant in nature, but only comprising a minority of the natural strains. The non-hemolytic strains seem to be more abundant in Bacillus licheniformis, while most Bacillus amyloliquefaciens strains appear hemolytic. All the non-hemolytic strains were tested for inhibition of growth of Clostridium perfringens. The following strains from screening were all hemolysis negative and among those selected for further studies: DSM 29869, DSM 29870, DSM 29871 and DSM 29872. Clostat (Bacillus PB6) was determined to be hemolytic.

Example 2: Determination of Inhibition of Growth of Clostridium perfringens

All the non-hemolytic strains were tested for inhibition of growth of Clostridium perfringens strains 23 and 48 (both are netB positive) [Gholamiandekhordi et al., 2006, Molecular and phenotypical characterization of Clostridium perfringens isolates from poultry flocks with different diseasestatus, Vet. Microbiol. 113:143-152], were grown overnight in tryptic soy broth (BD part 211822) supplemented with 0.6% yeast extract (BD part 212750) at 35° C. under static anaerobic conditions. 250 μL of the overnight culture of Clostridium perfringens was added to 250 mL of tryptic soy agar supplemented with 0.6% yeast extract at 40° C. and poured into rectangular petri plates (Nunc part 267060). The inoculated agar was allowed to cool at room temperature after which an 8 mm diameter well was made in the agar. Plates were stored in absence of oxygen until use.

The Bacillus strain DSM 29869, DSM 29870, DSM 29871, or DSM 29872 was grown overnight in tryptic soy broth at 35° C. under aerobic conditions. 1000 μL of Bacillus culture was collected and fractionated into cell-free supernatant and cells by centrifugation. 20 μL of cell-free supernatant or 100× diluted cells in phosphate buffered saline were added directly to the wells in the Clostridium perfringens inoculated agar plates. A control well contained 20 μL of phosphate buffer saline. The plates were incubated for 18 hours at 35° C. under anaerobic conditions.

Inhibition of the Clostridium perfringens strain was noted by a circular clearing zone around the well of interest. The phosphate buffer saline well was considered a negative control based on lack of clearing zone around the well.

Cell-free supernatant and 100× diluted cells of Bacillus strains DSM 29869, DSM 29870, DSM 29871, and DSM 29872 were able to consistently inhibit growth of C. perfringens strains 23 and 48 in vitro. Inhibition was also seen by competitor strain “CloSTAT”, for both supernatant and cells, but was not seen with competitor strain GalliproTect. “CloSTAT” is a strain of Bacillus amyloliquefaciens that was isolated from the commercial DFM product CloSTAT, Kemin. “GalliproTect” is a strain of Bacillus licheniformis that was isolated from the commercial product Gallipro Tect, Chr Hansen.

Example 3: Identification, Characterization and Deposit of the Biological Material

The following biological materials were deposited under the terms of the Budapest Treaty at Leibniz-lnstitut DSMZ-Deutsche Sammlung von Mikro-organismen und Zellkulturen GmbH, Inhoffenstraße 7 B, 38124 Braunschweig Germany, and given the following accession numbers:

TABLE 3.1 Deposit of Biological Material Identification Accession Number Date of Deposit Bacillus amyloliquefaciens DSM 29869 Jan. 12, 2015 Bacillus subtilis DSM 29870 Jan. 12, 2015 Bacillus subtilis DSM 29871 Jan. 12, 2015 Bacillus amyloliquefaciens DSM 29872 Jan. 12, 2015

The strains have been deposited under conditions that assure that access to the culture will be available during the pendency of this patent application to one determined by foreign patent laws to be entitled thereto. The deposits represent a substantially pure culture of the deposited strain. The deposits are available as required by foreign patent laws in countries wherein counterparts of the subject application or its progeny are filed. However, it should be understood that the availability of a deposit does not constitute a license to practice the subject invention in derogation of patent rights granted by governmental action.

Sequencing of 16S rDNA Genes

DNA was extracted from a culture of DSM 29869, DSM 29870, DSM 29871 and DSM 29872 using QiaAmp DNA Blood Mini Kit (Qiagen art 51106). The kit was used as recommended for extraction of DNA from gram positive bacteria.

16S rDNA was amplified in a total volume of 50 μl by mixing: 10 pmol of each of Primer 16S F and 16S R, 0.2 mM of each nucleotide, 2.5 units Ampli taq, 1×Ampli taq buffer, 5 μl DNA template and by using the following PCR program: 94° C. 2 min (94° C. 30 s, 52° C. 30 S, 72° C. 1 min)×35, 72° C. 10 min on a Perkin Elmer PCR machine. The PCR product was sequenced by Novozymes DNA sequencing facility using primer 530R, 357F, 1390R and 1100F.

TABLE 3.2  Primers: Primer Sequence SEQ ID NO  16S-F 5′-GAGTTTGATCCTGGCTCAG-3′ SEQ ID NO: 8  16S-R 5′-AGAAAGGAGGTGATCCAGCC-3′ SEQ ID NO: 9  794-R 5′-ATCTAATCCTGTTTGCTCCCC-3′ SEQ ID NO: 10  357-F 5′-TACGGGAGGCAGCAG-3′ SEQ ID NO: 11 1390-R 5′-CGGTGTGTRCAAGGCCC-3′ SEQ ID NO: 12 1000-F 5′-CAACGAGCGCAACCCT′, SEQ ID NO: 13

Degeneration of primer 1390-R: R is A or G. The 16 S rDNA sequences from DSM 29869, DSM 29870, DSM 29871 and DSM 29872 are shown as SEQ ID NO: 1-4 in the sequence listing respectively. The 16 S rDNA sequences from DSM 29869, DSM 29870, DSM 29871 and DSM 29872 were analyzed by BLAST against EMBL database and showed identity to 16 S rDNA sequences of Bacillus subtilis (SEQ ID NO: 2 and SEQ ID NO: 3) and to Bacillus amyloliquefaciens (SEQ ID NO: 1 and SEQ ID NO: 4).

In order to study the phylogenetic affiliation of SEQ ID NO: 1 to SEQ ID NO: 4 the sequences were analyzed by a ClustalW alignment in MegAlign (DNASTAR) using SEQ ID NO: 5 to SEQ ID NO: 7 as benchmark. These sequences are reference 16S rDNA sequences of the type strains of Bacillus vallismortis taken from AB021198 (SEQ ID NO: 5), Bacillus subtilis taken from AJ276351 (SEQ ID NO: 6) and Bacillus amyloliquefaciens taken from AB255669 (SEQ ID NO: 7).

The ClustalW alignment of SEQ ID NO: 1 to SEQ ID NO: 7 (FIG. 1) shows 7 nucleotide positions where 2 or more sequences have a nucleotide that deviates from the other. For numbering the positions in SEQ ID NO: 6 are used. At position 152 SEQ ID NO: 2 is identical to Bacillus amyloliquefaciens and Bacillus vallismortis, but different from the rest that are identical to each other. At position 174 SEQ ID NO: 1 and SEQ ID NO: 4 are identical to Bacillus amyloliquefaciens, but different from the rest that are identical to each other. At position 257 SEQ ID NO: 4 is identical to Bacillus amyloliquefaciens, but different from the rest that are identical to each other. At position 437, 444 and 455 SEQ ID NO: 2 and SEQ ID NO: 3 are identical to Bacillus subtilis, but different from the rest that are identical to each other. At position 1223 SEQ ID NO: 1 is identical to Bacillus amyloliquefaciens, but different from the rest that are identical to each other. The variation in the 16S rDNA genes support the species affiliation seen in the BLAST report.

Description of the Biological Material

Bacillus amyloliquefaciens DSM 29869 was isolated by Novozymes (Novo Nordisk) from an environmental sample collected at Jamaica in 1990. The strain was identified as Bacillus amyloliquefaciens based on 16S rDNA sequencing

Bacillus subtilis DSM 29870 was isolated by Novozymes (Novo Nordisk) from an environmental sample collected at Jamaica in 1990. The strain was identified as Bacillus subtilis based on 16S rDNA sequencing.

Bacillus subtilis DSM 29871 was isolated for Novozymes by a Danish high-school student at Branderslev Gymnasium from a soil sample from private property in Denmark in 2008. The strain was identified as Bacillus subtilis based on 16S rDNA sequencing. Bacillus amyloliquefaciens DSM 29872 was isolated from an environmental sample from the USA in 2008. The strain was identified as Bacillus amyloliquefaciens based on 16S rDNA sequencing.

Example 4: Determination of Inhibition of Growth of Escherichia coli

Escherichia coli strains, ATCC10536 or ATCC25922, were grown overnight in tryptic soy broth (BD part 211822) supplemented with 0.6% yeast extract (BD part 212750) at 35° C. under static anaerobic conditions. 100 μL of the overnight culture of Escherichia coli was added to 250 mL of tryptic soy agar supplemented with 0.6% yeast extract at 40° C. and poured into rectangular petri plates (Nunc part 267060). The inoculated agar was then allowed to cool at room temperature after which an 8 mm diameter well was made in the agar.

The Bacillus strain DSM 29869, DSM 29870, DSM 29871, or DSM 29872 was grown overnight in tryptic soy broth at 35° C. under aerobic conditions. 1000 μL of Bacillus subtilis culture was collected and fractionated into cell-free supernatant and cells by centrifugation. 20 μL of cell-free supernatant or 100× diluted cells in phosphate buffer saline were added directly to the wells in the Escherichia coli inoculated agar plates. A control well contained 20 μL of phosphate buffer saline. The plates were incubated for 18 hours at 30° C. under aerobic conditions.

Inhibition of the Escherichia coli strain was noted by a circular clearing zone around the well of interest. The phosphate buffer saline well was considered a negative control based on lack of clearing zone around the well.

Cell-free supernatant and 100× diluted cells of Bacillus strains DSM 29869, DSM 29870, DSM 29871, and DSM 29872 were able to consistently inhibit growth of the E. coli strains ATCC10535 and ATCC25922 in vitro. Inhibition was also seen by competitor strain CloSTAT, for both supernatant and cells.

Example 5: Sensitivity to Antibiotics

The minimal inhibitory concentrations (MIC) of eight antibiotics against Bacillus strains DSM 29869, DSM 29870, DSM 29871, and DSM 29872 were determined using broth micro dilution essentially as described in the CLSI guidelines (M07-A9 Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria That Grow Aerobically; 2012). Only modification was that volumes were changed; 90 μl Mueller Hinton Broth 2 with bacteria was added to 10 μl antibiotics dilutions, cfu's of bacteria and concentration of antibiotics were changed so final concentrations and final cfu's matched the guideline. The plates were incubated for 20-24 h instead of 16-20 h. The control strain recommended in the CLSI standard Staphylococcus aureus ATCC 29213 was used as control strain.

Strains:

Bacillus amyloliquefaciens DSM 29869 Bacillus subtilis DSM 29870 Bacillus subtilis DSM 29871 Bacillus amyloliquefaciens DSM 29872 S. aureus ATCC 29213

Antibiotics:

Chloramphenicol (Sigma C1919, 10 mg/ml, solubilized in 96% ethanol) Clindamycin (Sigma PHR1159, 10 mg/ml, solubilized in water) Erythromycin (ABBOTICIN from Amdipharm 40501, 50 mg/ml, solubilized in 96% ethanol) Gentamycin (Biomedicals inc., 190057, 10 mg/ml, solubilized in water) Kanamycin (Sigma, CAS no. 25389-94-0, 50 mg/ml, solubilized in water) Streptomycin (Sigma, S1277, 10 mg/ml, solubilized in water) Tetracycline (Sigma, T3383, 10 mg/ml, solubilized in water) Vancomycin (Sigma, V-8138, 10 mg/ml, solubilized in water)

Mueller Hinton Broth 2 (Sigma/Fluka 90922) 0.9% NaCl (Sigma/RdH 31434/Merck 106404)

Tryptone soya agar plates (Oxoid CM 131) Microtiter plates: Costar plate, polypropylene, round bottom, Corning 3879

Preparation of Bacteria:

A few colonies of Bacillus spp. (<1 day old) were inoculated into Mueller Hinton Broth 2 (MHB) and incubated for around 4 hours at 37° C. OD₆₀₀ (BioPhotometer plus, Eppendorf) was measured and adjusted to 0.25 (equivalent to McFarland 0.5) in MHB. For the control strain direct colony suspension was used. A few colonies of S. aureus ATCC 29213 (<1 day old) were suspended in MHB and OD₆₀₀ (BioPhotometer plus, Eppendorf) was measured and adjusted to 0.10-0.12 (equivalent to McFarland 0.5) in MHB. The bacterial suspensions were diluted 200× in MHB.

Preparation of Assay Plates:

Antibiotics were diluted to the concentration of 640 μg/mL in MHB. A two fold dilution series was prepared in MHB down to the concentration 0.625 μg/ml. 10 μl of each dilution and of each antibiotic was pipetted into a micro-titre plate. Later, when the antibiotics were mixed with the suspension of bacteria, the samples were diluted 10×(10 μL sample in a total volume of 100 μl). This resulted in the final test range of 0.06-64 μg/ml.

If the plates were not used right away the plates were stored in the freezer at −20° C. until usage.

90 μl of the bacterial suspensions were added to the assay plates. The assay plates were incubated in a plastic bag with at wet cloth at 37° C. for 20-24 h. The MIC was determined as the lowest concentration of antibiotic that completely inhibited growth of bacteria as detected by the unaided eye.

CFU Estimation:

A 10-fold dilution series in 0.9% NaCl was made to the 10⁻³ of the cultures inoculated into the micro-titre plate. 2×100 ul from the 10⁻³ dilution were plated onto two TSA plates. The plates were incubated overnight at 37° C. Number of CFU/ml was counted.

Three biological replicates of the assay were performed for Bacillus subtilis DSM 29871, Bacillus amyloliquefaciens DSM 29869 and Bacillus subtilis DSM 29870 (MIC 1-3), while four biological replicates were performed for Bacillus amyloliquefaciens DSM 29872 (MIC 2-5).

Results:

The MIC values obtained for B. subtilis DSM 29870 showed that the breakpoint values were equal to or below the breakpoint values given in the EFSA guideline (EFSA Journal 2012; 10(6):2740). For B. subtilis DSM 29869 the MIC values obtained in two out of the three biological replicates showed MIC values equal to or below the breakpoint. In MIC 1 the value for Tetracycline was 16. However, due to analytical variance of the method MIC results of one dilution above the breakpoint is in general accepted and the strain may be regarded as being sensitive. Thus, according to EFSA these two strains are regarded as sensitive to all the 8 antibiotics included in the test (Tables 5.2 and 5.3).

For the strains B. subtilis DSM 29871 and B. amyloliquefaciens DSM 29872 the MIC values showed that the two strains were sensitive to seven out of the eight antibiotics (Tables 5.1 and 5.4). An increased tolerance was observed towards Streptomycin and according to EFSA the strains are classified as resistant to Streptomycin.

As a control S. aureus ATCC 29213 was tested in parallel and had MIC values within the ranges given by the CLSI standard (M100-S24 Performance Standards for Antimicrobial Susceptibility Testing; informational Supplement, 2014) (Table 5.5).

The amount of bacteria inoculated into the assay plates was measured (CFU/ml). In general the CFU/ml was very close to the target value of 5*10⁵ CFU/ml. However, the CFU/ml for Bacillus strains may be associated with some uncertainty, since the bacteria tend to aggregate and once aggregated will only result in one colony forming unit (Tables 5.1 and 5.2).

TABLE 5.1 MIC results for B. subtilis DSM 29871 MIC 1 MIC 2 MIC 3 EFSA* breakpoints Antibiotic μg/ml μg/ml μg/ml μg/ml Chloramphenicol 8 4 8 8 Clindamycin 0.5 0.25 0.5 4 Erythromycin 0.125 0.125 0.125 4 Gentamycin 0.25 0.125 0.25 4 Kanamycin 2 1 2 8 Streptomycin 32 16 32 8 Tetracycline 2 4 4 8 Vancomycin 0.25 0.25 0.25 4 CFU/ml 3.6*10⁵ n.r. n.r. *EFSA Journal 2012; 10(6): 2740 n.r. not registered

TABLE 5.2 MIC results for B. amyloliquefaciens DSM 29869 MIC 1 MIC 2 MIC 3 EFSA* breakpoints Antibiotic μg/ml μg/ml μg/ml μg/ml Chloramphenicol 4 4 4 8 Clindamycin 1 0.5 1 4 Erythromycin 0.5 0.06 0.06 4 Gentamycin 0.5 0.125 0.06 4 Kanamycin 2 0.5 0.5 8 Streptomycin 2 4 4 8 Tetracycline 16 8 8 8 Vancomycin 0.25 0.25 0.25 4 CFU/ml 3.9*10⁵ 2.7*10⁵ 1.2*10⁵ *EFSA Journal 2012; 10(6): 2740

TABLE 5.3 MIC results for B. subtilis DSM 29870 MIC 1 MIC 2 MIC 3 EFSA* breakpoints Antibiotic μg/ml μg/ml μg/ml μg/ml Chloramphenicol 4 8 4 8 Clindamycin 0.25 0.25 0.25 4 Erythromycin 0.125 0.125 0.125 4 Gentamycin 0.25 0.125 0.25 4 Kanamycin 2 1 2 8 Streptomycin 4 4 8 8 Tetracycline 0.25 0.25 0.25 8 Vancomycin 0.25 0.25 0.25 4 CFU/ml 4.2*10⁵ 2.1*10⁵ 1.4*10⁵ *EFSA Journal 2012; 10(6): 2740

TABLE 5.4 MIC results for B. amyloliquefaciens DSM 29872 MIC 2 MIC 3 MIC 4 MIC 5 EFSA* breakpoints Antibiotic μg/ml μg/ml μg/ml μg/ml μg/ml Chloramphenicol 4 4 4 4 8 Clindamycin 0.5 0.5 0.5 0.5 4 Erythromycin 0.06 0.125 0.06 0.06 4 Gentamycin 0.06 0.06 0.125 0.125 4 Kanamycin 1 0.5 2 1 8 Streptomycin 8 (32) 8 32 >64 8 Tetracycline 0.25 0.25 0.125 0.125 8 Vancomycin 0.25 0.25 0.125 0.125 4 CFU/ml 2.7*10⁵ 1.5*10⁵ 4.7*10⁵ 6.3*10⁵ *EFSA Journal 2012; 10(6): 2740

TABLE 5.5 MIC results for S. aureus ATCC 29213 MIC 1 MIC 2 MIC 3 MIC 4 MIC 5 CLSI* breakpoints Antibiotic μg/ml μg/ml μg/ml μg/ml μg/ml μg/ml Chloramphenicol 8-16 16 8 16 16    2-16 Clindamycin 0.125 0.25 0.125 0.06 0.06   0.06-0.25 Erythromycin 0.5 0.5 0.5 0.5 0.5 0.25-1 Gentamycin 0.5 0.5 0.5 1 1 0.12-1 Kanamycin 4 4 4 4 4   1-4 Streptomycin 8 8 8 16 8 No information Tetracycline 0.5 1 1 0.5 0.5 0.12-1 Vancomycin 0.5 1 1 1 1  0.5-2 CFU/ml 5.2*10⁵ 7.0*10⁵ 7.0*10⁵ 7.3*10⁵ 4.3*10⁵ *M100-S24 Performance Standards for Antimicrobial Susceptibility Testing; informational Supplement, 2014

Example 6: Enzyme Activity Preparation of Overnight Pre-Cultures

Overnight cultivation was made in a 96-deep well plate with 1.25 mL of LB broth (Difco; BD #244610) per well. Each strain was tested in duplicate and inoculated with a single colony from a pure Standard Methods Agar plate (SMA plates, Smith River Biologicals #11-00450). Before incubation, a single sterile Aeraseal breathable seal (Fisher #50-212-463) was placed on top of the plate, and the plate was incubated with shaking at 35° C. overnight under aerobic conditions.

Determination of Anaerobic Growth

SMA plates were streaked from the overnight cultures using a 10 μL inoculating loop. Up to four strains were streaked per plate, into separate quadrants.

Plates were incubated at 39° C. in an AnaeroJar (Thermo Scientific Oxoid, Fisher#OXAG0025A) along with an AnaeroGen sachet (Thermo Scientific Oxoid, Fisher #OXAN0025A) to maintain anaerobic conditions (˜0.1% oxygen). Work was performed under aseptic conditions in biological hood, using sterile materials.

Enzyme Activity Determination Using AZCL-Substrate Agar Plates

Preparation of media with AZCL substrates which can be autoclaved AZCL-cellulose (AZCL-HE-Cellulose, I-AZCEL, Megazyme), arabinoxylan (AZCL-Arabinoxylan, wheat, I-AZWAX, Megazyme), arabinan (AZCL-Arabinan, debranched, I-AZDAR, Megazyme):

Into two (2) 500 mL beakers, 300 mL of 0.1× and 1×LB agar were prepared for each beaker, with a magnetic stir bars added to each. While stirring, 100 mL of LB condition from the beakers were added to three (3) 250 mL Wheaton bottles, thus giving 3 bottles with 0.1×LB and 3 bottles with 1×LB. AZCL-cellulose, arabinan, and arabinoxylan were then added separately to each of a 1× and a 0.1× bottle with stirring. A total of 0.05 grams of substrate is added per 100 mL of media. If more than 100 mL of media is being used, the amount of substrate added is adjusted by using the 0.05 g/100 mL ratio. The media were autoclaved to sterilize. Note: Only these three AZCL substrates can be autoclaved without obvious dye release indicating substrate instability. After autoclaving, media is kept at >50° C. until ready to pour plates. The pH was checked, and if necessary adjusted to pH 7 using 10% HCl or 2N NaOH, maintaining sterility.

Preparation of Media with AZCL Substrates which Can't be Autoclaved

These substrates were: AZCL-amylose (I-AZAMY, Megazyme), AZCL-casein (I-AZCAS, Megazyme), AZCL-xylan (Xylan, birchwood (I-AZXBW, Megazyme)

Into two (2) 1000 mL Wheaton bottles, 400 mL of 0.1×LB and 1×LB was prepared and a magnetic stir bar was added to each. The media was autoclaved to sterilize, prior to adding AZCL reagent. After autoclaving, media was kept at 50-55° C. until ready to add AZCL substrate and pour plates. The pH was checked, and if necessary adjusted to pH 7 using 10% HCl or 2N NaOH, maintaining sterility.

Pouring AZCL Substrate Media Agar Plates

Work was performed under aseptic conditions in biological hood, using sterile materials. These steps were done relatively quickly, so that the agar did not solidify before transferring into the 96-well plate.

For substrates which could be autoclaved (AZCL-cellulose, AZCL-arabinoxylan, AZCL-arabinan): The warm (−50° C.), autoclaved liquid agar media was magnetically stirred in order to suspend the insoluble AZCL substrate. An aliquot was transferred to a sterile solution basin (Periodic mixing of the material in the solution basin was necessary to keep the substrate suspended.) A repeating, multi-channel pipette (e.g., Matrix 1250 μL pipet along with the corresponding 1250 μL sterile pipet tips) was used to dispense 180 μL into each well of a sterile 96-well plate. A set of tips would typically last for up to six columns per plate. Once the plate was filled, a sterile lid was added, and it was allowed to solidify. One plate was made for each substrate (AZCL-cellulose, AZCL-arabinoxylan, AZCL-arabinan) and condition (0.1× and 1×LB).

For the substrates that could not be autoclaved (AZCL-amylose, AZCL-casein, AZCL-xylan): Into a sterile 250 mL beaker with magnetic stir-bar was added 100 mL of warm, sterile 0.1× or 1×LB media (no AZCL substrate added). With stirring, add 0.05 mg of AZCL substrate, and continue stirring until re-suspended. It may help to add the substrate slowly at first. Once substrate was re-suspended, it was poured into solution basin and added to plates as described above. One plate was made for each substrate (AZCL-cellulose, AZCL-arabinoxylan, AZCL-arabinan) and condition (0.1× and 1×LB).

Inoculating the 96-Well Plates, Incubation, and Evaluation

Work was performed under aseptic conditions in biological hood, using sterile materials. The AZCL substrate agar plates were inoculated by applying 2 μL of overnight culture that was dispensed on top of the agar. The added liquid should be visible on top of the agar. When moving to the next plate, be sure that there are no drops left at the end of the pipet tips to ensure that each well has been inoculated. Repeat for all AZCL substrate plates. Control enzyme dilutions were prepared, each at 1/100, diluting in sterile phosphate dilution buffer: 10 μL enzyme preparation+990 μL buffer. Control enzyme wells were then inoculated with 10 μL of the appropriate enzyme dilution for each substrate.

TABLE 6.1 Enzymes and respective substrates Enzyme Substrate Amylase Amylose Arabinase Arabinan Cellulase Cellulose Protease Casein Xylanase Arabinoxylan, Xylan

TABLE 6.2 Enzyme production under aerobic conditions 30° C. Aerobic, 24 h organism ID Amylose Arabinan Arabinoxylan Casein Cellulose Xylan DSM 29869 + + + + − + DSM 29870 + + + + − + DSM 29871 + + + + + + DSM 29872 + + + + − +

TABLE 6.3 Enzyme production under anaerobic conditions, 24 hours 30° C. Anaerobic, 24 h organism ID Amylose Arabinan Arabinoxylan Casein Cellulose Xylan DSM 29869 + + + − − + DSM 29870 + + +/− + − + DSM 29871 − + + − + + DSM 29872 + + + − − +

TABLE 6.4 Enzyme production under anaerobic conditions, 48 hours 30° C. Anaerobic, 48 h organism ID Amylose Arabinan Arabinoxylan Casein Cellulose Xylan DSM 29869 + + + + − + DSM 29870 + + +/− + − + DSM 29871 − + + − + + DSM 29872 + + + − − +

Example 7: Efficacy of the DSM 29870 Strain in Clostridium perfringens Challenge Conditions Material and Methods

Three independent battery studies have been conducted to evaluate the influence of the strain DSM 29870 on the development of an induced necrotic enteritis.

In each experiment, a total of 256 one day-old male broiler chickens Cobb×Cobb were allocated to Petersime battery cages (8 birds/cage). Cages were used in factorial and completely randomized design with 8 cages per treatment (i.e., 64 animals/treatment).

An unmedicated corn/soybean meal-based commercial broiler starter ration was formulated (Table 7.1). Feed and water were available ad libitum throughout the trials.

TABLE 7.1 Composition of the basal experimental diet⁴ (starter d 1-d 28) Starter (0-28) Ingredients Corn, yellow, ground 56.12 Soybean meal (48) 37.50 Fat, poultry 3.00 Dicalcium phosphate 1.75 Limestone 0.80 Salt 0.30 Vitamin premix¹ 0.25 DL-Methionine 0.20 Trace mineral premix² 0.08 Calculated Nutritional Content ME, kcal/kg 3.096 Protein, % 22.30 Lysine, % 1.180 Methionine, % 0.530 Met + Cys, %³ 0.890 ¹Vitamin mix provided the following (per kg of diet): thiamin•mononitrate, 2.4 mg; nicotinic acid, 44 mg; riboflavin, 4.4 mg; D-Ca pantothenate, 12 mg; vitamin B₁₂ (cobalamin), 12.0 μg; pyridoxine•HCL, 4.7 mg; D-biotin, 0.11 mg; folic acid, 5.5 mg; menadione sodium bisulfite complex, 3.34 mg; choline chloride, 220 mg; cholecalciferol, 27.5 ug; trans-retinyl acetate, 1,892 ug; all-rac α tocopheryl acetate, 11 mg; ethoxyquin, 125 mg. ²Trace mineral mix provided the following (per kg of diet): manganese (MnSO₄•H₂O), 60 mg; iron (FeSO₄•7H₂O), 30 mg; zinc (ZnO), 50 mg; copper (CuSO₄•5H₂O), 5 mg; iodine (ethylene diamine dihydroiodide), 0.15 mg; selenium (NaSe0₃), 0.3 mg. ³Met = methionine; Cys = cysteine. ⁴The basal feed will not contain any probiotic/prebiotic feed additives, NSPases, coccidiostats or antibiotic growth promoter.

The 4 experimental groups consisted in (Table 7.2): T1, non-infected and non-treated animals; T2, C. perfringens infected and non-treated animals; T3, C. perfringens infected animals fed with the basal diet containing bacitracin (included at 50 ppm, from d1 to d28); T4, C. perfringens infected animals fed with the basal diet containing the DSM 29870 strain (included at 1.10⁹ CFU/kg of feed in trial 1 and 5.10⁸ CFU/kg of feed in trials 2 and 3, from d1 to d28).

TABLE 7.2 Experimental treatments Treatments T1 Non-infected, non-treated T2 Infected, non-treated T3 Infected, bacitracin T4 Infected, DSM 29870

On day 14, all birds were orally inoculated with a coccidial inoculum containing approximately 5,000 oocysts of Eimeria maxima per bird.

Once daily on d19, d20 and d21, all birds, except T1, were administered (by oral gavage) 1 mL of a fresh broth culture of C. perfringens.

On d21, three birds from each cage were selected, sacrificed, weighed, and examined for the degree of presence of necrotic enteritis lesions. The scoring was based on a 0 to 3 score, with 0 being normal and 3 being the most severe.

The live body weight and the feed were recorded at the start (d1) and the end of the experiment (d28), on a cage basis, to calculate performance:

Body Weight Gain (BWG)=(Live Body Weight)_(d28)−(Live Body Weight)_(d1)

Feed Conversion Ratio (FCR)=ratio between feed consumed and weight gained

Mortality was recorded daily and the FCR was adjusted accordingly.

Necrotic enteritis lesion scores, total mortality and % of dead birds with necrotic enteritis lesions were also calculated

Data (n=32) were subjected to an ANOVA, with complete randomized block design using the ANOVA procedure of XLSTAT (Addinsoft 1995-2014) to establish differences between diets. Pen was considered as the experimental unit. The model included diets (n=4) and block as fixed effect. Results are reported as least square means. LS means were assumed to be different at P: 0.05.

Experimental Results

The results obtained on performance, necrotic enteritis lesion scores, mortality and % of dead birds with necrotic enteritis lesions parameters are shown in Tables 7.3.

TABLES 7.3 Effect of dietary supplementation of the strain DSM 29870 on the negative impact on production parameters due to induced necrotic enteritis in three independent trials. Total Dead birds with BWG⁵ Lesion mortality necrotic enteritis (g/bird) FCR⁵ score⁶ (%) lesions (%) Trial 1 (d 1-d 28) (d 1-d 28) (d 21) (d 1-d 28) (d 1-d 28) T1¹ 720a  1.666c 0.0a 7.5b 0.0b T2² 549b  2.071a 0.2a 27.5a 17.2a T3³ 633ab 1.813bc 0.2a 5.0b 1.6b T4⁴ 628ab 1.843bc 0.3a 5.0b 3.1b ¹Non-infected, non-treated group fed with the basal diet. ²Infected, non-treated group fed with the basal diet. ³Infected group fed with the basal diet supplemented with bacitracin (50 ppm). ⁴Infected group fed with the basal diet supplemented with DSM 29870 (1.10⁹ CFU/kg of feed). ⁵Means from 8 replicates of 8 birds per cage for each group. Raw data (n = 32) were analyzed using variance analysis with block (n = 8) and treatments (n = 4) as fixed effect. ⁶Means from 8 replicates of 3 birds per cage for each group. Raw data (n = 32) were analyzed using variance analysis with block (n = 8) and treatments (n = 4) as fixed effect. a,b,cValues with different superscripts are significantly (P < 0.05) different from each other. Total Dead birds with BWG⁵ Lesion mortality necrotic enteritis (g/bird) FCR⁵ score⁶ (%) lesions (%) Trial 2 (d 1-d 28) (d 1-d 28) (d 21) (d 1-d 28) (d 1-d 28) T1 685a  1.692b 0.0d 2.5c 0.0c T2 435c  2.404a 1.2a 32.5a 20.3a T3 665ab 1.759b 0.6b 12.5bc 6.3c T4 654ab 1.768b 0.4bc 25.0ab 9.4bc ¹Non-infected, non-treated group fed with the basal diet. ²Infected, non-treated group fed with the basal diet. ³Infected group fed with the basal diet supplemented with bacitracin (50 ppm). ⁴Infected group fed with the basal diet supplemented with DSM 29870 (5.10⁸ CFU/kg of feed). ⁵Means from 8 replicates of 8 birds per cage for each group. Raw data (n = 32) were analyzed using variance analysis with block (n = 8) and treatments (n = 4) as fixed effect. ⁶Means from 8 replicates of 3 birds per cage for each group. Raw data (n = 32) were analyzed using variance analysis with block (n = 8) and treatments (n = 4) as fixed effect. a,b,cValues with different superscripts are significantly (P < 0.05) different from each other. Total Dead birds with BWG⁵ Lesion mortality necrotic enteritis (g/bird) FCR⁵ score⁶ (%) lesions (%) Trial 3 (d 1-d 28) (d 1-d 28) (d 21) (d 1-d 28) (d 1-d 28) T1 667a 1.752c 0.0b 10.0a 0.0c T2 521b 1.988a 0.5a 25.0a 15.6a T3 645a 1.786bc 0.6a 15.0a 4.7bc T4 638a 1.851b 0.4a 10.0a 4.7bc ¹Non-infected, non-treated group fed with the basal diet. ²Infected, non-treated group fed with the basal diet. ³Infected group fed with the basal diet supplemented with bacitracin (50 ppm). ⁴Infected group fed with the basal diet supplemented with DSM 29870 (5.10⁸ CFU/kg of feed). ⁵Means from 8 replicates of 8 birds per cage for each group. Raw data (n = 32) were analyzed using variance analysis with block (n = 8) and treatments (n = 4) as fixed effect. ⁶Means from 8 replicates of 3 birds per cage for each group. Raw data (n = 32) were analyzed using variance analysis with block (n = 8) and treatments (n = 4) as fixed effect. a,b,cValues with different superscripts are significantly (P < 0.05) different from each other.

The data obtained from the three challenge studies showed that the strain DSM 29870 can counteract the negative impact of an induced necrotic enteritis on the production parameters with a significant effect in all challenge trials on the FCR and the mortality due to necrotic enteritis, relative to the positive control group (non-infected, non-treated animals).

Furthermore, there was no significant difference between the DSM 29870 fed group and the bacitracin fed group with regards to all parameters measured in these trials.

The challenge studies described above showed that the administration of the DSM 29870 strain could prevent necrotic enteritis in broiler chickens.

Example 8: First Performance Trial with Broiler Chickens (521) Material and Methods

A total of 2000 one day-old male broiler chickens Cobb 500 were individually weighed (body weight 42 g±1 g) and allocated in floor pens (50 birds/pen). Pens were used in factorial and completely randomized design with 8 pens per treatment (i.e., 400 animals/treatment). The 5 experimental treatments consisted in (Table 8.1): T1, negative control basal diets; T2, basal diets containing the strain DSM 29870 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T3, basal diets containing the strain DSM 29871 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T4 basal diets containing the strain DSM 29872 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T5, basal diet containing a marketed probiotic, GalliPro Max (included at the commercial dose, 8.10⁸ CFU/kg of feed, from d1 to d35).

Basal diets consisted in 3 phases feeding program: starter phase (from 1 to day 12), grower phase (from 13 to day 28) and finisher phase (from 29 to day 35). Every phase was formulated to meet or exceed animal requirement and agree with standard commercial US corn-soybean meal-based broiler diets. The dietary and raw material composition of these diets is given in Table 8.2. All experimental diets include phytase (Ronozyme P, 250 FYT/kg) and did not contain any coccidiostat, NSPase or growth promoting substance. Feed and water were available ad libitum throughout the trial.

TABLE 8.1 Experimental treatments Treatments T1 Control T2 T1 + DSM 29870 T3 T1 + DSM 29871 T4 T1 + DSM 29872 T5 T1 + GalliPro Max

TABLE 8.2 Composition of the basal experimental diets Starter Grower Finisher (0-12 d) (13-28 d) (29-35 d) % Ingredients Corn, yellow, grain 64.673 66.460 68.491 Soybean meal, dehulled, solvent 29.020 26.662 24.677 Ampro 55 (animal by-product 55% 2.500 3.000 3.000 protein) Calcium carbonate 0.886 0.735 0.684 Fat, vegetable 0.883 1.485 1.702 Dicalcium phosphate 0.706 0.612 0.500 Salt, plain (NaCl) 0.439 0.435 0.436 Methionine MHA 0.358 0.259 0.221 L-Lysine 0.273 0.208 0.145 L-Threonine 98.5 0.103 0.000 0.000 Trace Mineral¹ 0.075 0.075 0.075 Vitamin premix ² 0.065 0.050 0.050 Ronozyme P-(ct) 0.019 0.019 0.019 Calculated Nutritional Content ME (kcal/kg) 3,067 3,130 3,165 Crude protein (%) 20.96 20.03 19.16 Dig. Lysine (%) 1.20 1.10 1.00 Dig. Methionine (%) 0.61 0.52 0.48 Dig. TSAA (%) 0.90 0.80 0.75 Dig. Threonine (%) 0.81 0.68 0.65 Calcium (%) 0.90 0.85 0.8 Avail. phosphorus (%) 0.42 0.42 0.4 ¹Vitamin mix will provide the following (per kg of diet): thiamin•mononitrate, 2.4 mg; nicotinic acid, 44 mg; riboflavin, 4.4 mg; D-Ca pantothenate, 12 mg; vitamin B₁₂ (cobalamin), 12.0 μg; pyridoxine•HCL, 4.7 mg; D-biotin, 0.11 mg; folic acid, 5.5 mg; menadione sodium bisulfite complex, 3.34 mg; choline chloride, 220 mg; cholecalciferol, 27.5 ug; trans-retinyl acetate, 1,892 ug; all-rac α tocopheryl acetate, 11 mg; ethoxyquin, 125 mg. ² Trace mineral mix provided the following (per kg of diet): manganese (MnSO₄•H₂O), 60 mg; iron (FeSO₄•7H₂O), 30 mg; zinc (ZnO), 50 mg; copper (CuSO₄•5H₂O), 5 mg; iodine (ethylene diamine dihydroiodide), 0.15 mg; selenium (NaSe0₃), 0.3 mg.

The live body weight and the feed were recorded at the start (d1) and the end of the experiment (d35), on a pen basis, to calculate performance:

Feed Intake (FI)=(Remaining Feed)_(d35)−(Issued Feed)_(d1)

Body Weight Gain (BWG)=(Live Body Weight)_(d35)−(Live Body Weight)_(d1)

-   -   Feed Conversion Ratio (FCR)=ratio between feed consumed and         weight gained

Mortality was recorded daily and the FCR was adjusted accordingly.

Data (n=40) were subjected to an ANOVA, with complete randomized block design using the ANOVA procedure of XLSTAT (Addinsoft 1995-2014) to establish differences between diets. Pen was considered as the experimental unit. The model included diets (n=5) and block as fixed effect. Results are reported as least square means. LS means were assumed to be different at P: 0.05.

Similar calculations were realized in the example 9 and 10.

Experimental Results

The results obtained on performance parameters for the whole experimental period are shown in Table 8.3.

TABLE 8.3 Effect of dietary supplementation of the strains DSM 29870, DSM 29871 and DSM 29872 on broiler performance DSM 29870² DSM 29871² DSM 29872² GalliPro Max³ supplemented supplemented supplemented supplemented Parameters⁴ Control¹ group group group group FI (g/bird) 3245a 3256a 3221a 3263a 3203a Relative to the control — +0.3% −0.7% +0.6% −1.3% BWG (g/bird) 1987ab 2026ab 2002ab 2038a 1973b Relative to the control — +2.0% +0.8% +2.6% −0.7% FCR 1.633a 1.607b 1.609b 1.602b 1.624ab Relative to the control — −1.6% −1.5% −2.0% −0.6% Mortality (%) 3.25a 3.50a 5.25a 4.5a 6.25a ¹Group fed with the basal diet. ²DSM 29870/29871/29872 supplemented group fed with the basal diet including strain DSM 29870/29871/29872 at 5.10⁸ CFU/kg of feed. ³GalliPro Max supplemented group fed with the basal diet including GalliPro Max at 8.10⁸ CFU/kg of feed. ⁴Means from 8 replicates of 50 birds per pen for each group. Raw data (n = 24) were analyzed using variance analysis with block (n = 8) and treatments (n = 3) as fixed effect. a, b, c Values with different superscripts are significantly (P < 0.05) different from each other.

Feed additives did not significantly affect animal feed intake relative to the control. Body weight was slightly increased using the NZB strains whereas GalliPro Max tended to decrease this parameter.

The DSM 29870, DSM 29871 and DSM 29872 strains also improved significantly the feed conversion ratio by 1.6%, 1.5% and 1.9%, respectively, with no significant differences between the groups fed with NZB strains. GalliPro Max had only a slight and non-significant effect on the feed conversion ratio.

None of the probiotic tested here had a significant effect on the mortality level.

Example 9: Second Performance Trial with Broiler Chickens (522) Material and Methods

A total of 900 one day-old male broiler chickens Ross 708 were individually weighed (body weight 47.1 g±1.1 g) and allocated in floor pens (15 birds/pens). Pens were used in factorial and completely randomized design with 12 pens per treatment (i.e., 180 animals/treatment). The 5 experimental treatments consisted in (Table 9.1): T1, negative control basal diets; T2, basal diets containing the strain DSM 29870 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T3, basal diets containing the strain DSM 29871 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T4 basal diets containing the strain DSM 29872 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T5, basal diet containing a marketed probiotic, GalliPro Max (included at the commercial dose, 8.10⁸ CFU/kg of feed, from d1 to d35).

Basal diets consisted in 3 phases feeding program: starter phase (from 1 to day 14), grower phase (from 15 to day 21) and finisher phase (from 22 to day 35). Every phases were formulated to meet or exceed animal requirement and agree with standard commercial US corn-soybean meal-based broiler diets. The dietary and raw material composition of these diets is given in Table 9.2. All experimental diets included vitamin and mineral premixes, but did not contain any coccidiostat, NSPase, phytase or growth promoting substance. Feed and water were available ad libitum throughout the trial.

TABLE 9.1 Experimental treatments Treatments T1 Control T2 T1 + DSM 29870 T3 T1 + DSM 29871 T4 T1 + DSM 29872 T5 T1 + GalliPro Max

TABLE 9.2 Composition of the basal experimental diets Starter Grower Finisher (0-14 d) (15-21 d) (22-35 d) % Ingredients Corn 57.59 59.20 62.30 Wheat Flour 1.00 1.00 1.00 Soybean Meal (46% CP) 30.00 28.00 24.50 Poultry Meal 5.00 5.00 5.00 Poultry Fat 2.10 2.86 3.52 Limestone (36% Ca) 1.05 1.02 0.98 Dicalcium Phosphate (18% P) 1.76 1.52 1.42 Salt 0.35 0.32 0.29 Sodium Bicarbonate 0.16 0.14 0.11 L-Lysine HCL (78%) 0.23 0.22 0.21 DL-Methionine (99%) 0.36 0.33 0.29 L-Threonine (98%) 0.05 0.04 0.03 Selenium premix 0.05 0.05 0.05 Vitamin Mix 0.15 0.15 0.15 Mineral Mix 0.15 0.15 0.15 Calculated Nutritional Content ME (kcal/kg) 2968 3032 3096 Crude Protein (%) 23.3 22.4 20.78 Lysine (%) 1.35 1.29 1.18 Methionine (%) 0.69 0.65 0.59 Met + Cys (%) 1.05 1.00 0.92 Threonine (%) 0.86 0.81 0.75 Calcium (%) 1.03 0.96 0.91 Phosphorus Avail. (%) 0.46 0.41 0.39 ¹Vitamin mix will provide the following (per kg of diet): vitamin A, 13 227 513 IU; vitamin D3, 3 968 254 IU; vitamin E, 66 138 IU; vitamin B₁₂, 40 mg; biotin, 254 mg; menadione, 3 968 mg; thiamine, 3 968 mg; riboflavin, 13 228 mg; d-Pantothenic Acid, 22 046 mg; pyridoxine, 7 937 mg; niacin, 110 229 mg; folic acid, 2 205 mg; Selenium Premix: selenium, 600 ppm + calcium, 36% ²Trace mineral mix provided the following (per kg of diet): calcium, Min: 15.7% and Max: 18.7%; manganese (Mn), 6.0%; zinc (Zn), 6.0%; iron (Fe), 4.0%; copper (Cu), 5000 ppm; iodine (I), 1250 ppm; cobalt (Co), 500 ppm

Experimental Results

The results obtained on performance parameters for the whole experimental period are shown in Table 9.3.

TABLE 9.3 Effect of dietary supplementation of the strains DSM 29870, DSM 29871 and DSM 29872 on broiler performance DSM 29870² DSM 29871² DSM 29872² GalliPro Max³ supplemented supplemented supplemented supplemented Parameters⁴ Control¹ group group group group FI (g/bird) 3573a 3542a 3606a 3515a 3541a Relative to the control — −0.9% +0.9% −1.0% −0.9% BWG (g/bird) 2361a 2416b  2401ab 2424b  2398ab Relative to the control — +2.3% +1.7% +2.6% +1.5% FCR     1.513a     1.467b      1.501bc     1.451a      1.477ab Relative to the control — −3.6% −0.8% −4.2% −2.4% Mortality (%)    15.6ab    7.8a    11.7ab   19.4b    10.0a ¹Group fed with the basal diet ²DSM 29870/29871/29872 supplemented group fed with the basal diet including strain DSM 29870/29871/29872 at 5.10⁸ CFU/kg of feed. ³GalliPro Max supplemented group fed with the basal diet including GalliPro Max at 8.10⁸ CFU/kg of feed. ⁴Means from 12 replicates of 15 birds per pen for each group. Raw data (n = 36) were analyzed using variance analysis with block (n = 12) and treatments (n = 3) as fixed effect. a,b,cValues with different superscripts are significantly (P < 0.05) different from each other

Also in this experiment, the administration of the strains DSM 29870, DSM 29871, DSM 29872 and GalliPro Max did not significantly reduce the feed intake, but improved the body weight gain by 2.3%, 1.7%, 2.6% and 1.5%, respectively. Therefore, difference relatively to control was significant for DSM 29870 and DSM 29872.

The strains DSM 29870 and DSM 29872 improved significantly the feed conversion ratio by 3.6% and 4.2%, respectively. DSM 29871 and GalliPro Max also improved (slightly for DSM 29871) the feed conversion ratio in this experiment, but not significantly.

The strain DSM 29870 allowed a decrease of the mortality level in a numerically higher manner than GalliPro Max.

Example 10: Third Performance Trial with Broiler Chickens (051)

Material and methods A total of 1080 one day-old male broiler chickens Ross PM3 were individually weighed (body weight 42±3.5 g) and allocated in floor pens (18 birds/pens). Pens were used in factorial and completely randomized design with 12 pens per treatment (i.e., 216 animals/treatment). The 3 experimental treatments consisted in (Table 10.1): T1, negative control basal diets; T2, basal diets containing the strain DSM 29870 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T3, basal diets containing the strain DSM 29871 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T4 basal diets containing the strain DSM 29872 (included at 5.10⁸ CFU/kg of feed, from d1 to d35); T5, basal diet containing a marketed probiotic, GalliPro Max (included at the commercial dose, 8.10⁸ CFU/kg of feed, from d1 to d35).

Basal diets consisted in 3 phases feeding program: starter phase (from 1 to day 21) and grower phase (from 22 to day 35). Every phase was formulated to meet or exceed animal requirement and agree with standard commercial EU corn-soybean meal-based broiler diets. The dietary and raw material composition of these diets is given in Table 10.2. All experimental diets included vitamin and mineral premixes, but did not contain any coccidiostat, NSPase, phytase or growth promoting substance. Feed and water were available ad libitum throughout the trial.

TABLE 10.1 Experimental treatments Treatments T1 Control T2 T1 + DSM 29870 T3 T1 + DSM 29871 T4 T1 + DSM 29872 T5 T1 + GalliPro Max

TABLE 10.2 Composition of the basal experimental diets Starter Grower (0-21 d) (22-35 d) % Ingredients Maize 51.68 55.58 Soybean Meal (48% CP) 39.03 34.55 Soybean oil 4.27 5.18 DL-Methionine 0.22 0.17 Calcium carbonate 1.05 1.05 Dicalcium Phosphate 1.78 1.5 Salt 0.37 0.37 Wheat middlings 1.00 1.00 Premix¹ 0.6 0.6 Calculated Nutritional Content ME (kcal/kg) 3000 3100 Crude Protein (%) 22.25 20.5 Fat (%) 6.76 7.7 Cellulose (%) 3.15 3 Minerals (%) 5.74 5.3 Lysine (%) 1.25 1.13 Methionine (%) 0.55 0.48 Met + Cys (%) 0.92 0.83 Threonine (%) 0.87 0.8 Calcium (%) 0.93 0.85 Total phosphorus 0.7 0.63 Phosphorus Avail. (%) 0.38 0.33 ¹The premix will provide the following (per kg of diet): vitamin A, 12 000 IU; vitamin D3, 3 000 IU;, vitamin E = 300 IU;, vitamin K3, 3 mg; vitamin B, 2 mg; vitamin B2, 8 mg; vitamin B6, 3 mg; vitamin B12, 0.02 mg; folic acid, 1 mg; biotin, 0.2 mg; calcium pantothenate, 15 mg; nicotinic acid, 40 mg; manganese (Mn), 80 mg; zinc (Zn), 60 mg; iodine (I), 1 mg, iron (Fe), 80 mg; copper (Cu), 15 mg; cobalt (Co), 0.4 mg; selenium (Se), 0.2 mg; magnesium (Mg), 5 mg; Etoxyquin, 0.5 mg; BHA, 0.5 mg, citric acid, 5 mg; phosphoric acid, 5 mg.

Experimental Results

The results obtained on performance parameters for the whole experimental period are shown in Table 10.3.

TABLE 10.3 Effect of dietary supplementation of the strains DSM 29870, DSM 29871 and DSM 29872 on broiler performance DSM 29870² DSM 29871² DSM 29872² GalliPro Max³ supplemented supplemented supplemented supplemented Parameters⁴ Control¹ group group group group FI (g/bird) 3217a 3295a 3281a 3230a 3246a Relative to the control — +2.4% +2.0% +0.4% +0.9% BWG (g/bird) 2019b 2149a 2167a 2124a  2103ab Relative to the control — +6.5% +7.3% +5.2% +4.2% FCR     1.598a     1.534b     1.513b     1.521b     1.544b Relative to the control — −4.0% −5.3% −4.8% −3.4% Mortality (%)    11.1a    9.7a    8.3a    6.5a    7.4a ¹Group fed with the basal diet. ²DSM 29870/29871/29872 supplemented group fed with the basal diet including strain DSM 29870/29871/29872 at 5.10⁸ CFU/kg of feed. ³GalliPro Max supplemented group fed with the basal diet including GalliPro Max at 8.10⁸ CFU/kg of feed. ⁴Means from 12 replicates of 18 birds per pen for each group. Raw data (n = 36) were analyzed using variance analysis with block (n = 12) and treatments (n = 3) as fixed effect. a,b,cValues with different superscripts are significantly (P < 0.05) different from each other.

In this experiment, the administration of the strains DSM 29870, DSM 29871, DSM 29872 (as GalliPro Max) had not significant effect on the feed intake, but led to the significant improvement of the body weight gain by 6.5%, 7.3% and 5.2%, respectively. GalliPro Max improved also the body weight gain (+4.2%), but not significantly.

All NZB strains improved significantly the feed conversion ratio by 4.0%, 5.3% and 4.8% (DSM 29870, DSM 29871 and DSM 29872, respectively) as GalliPro Max which reached 3.4% of improvement.

Regarding the mortality level, there were no significant differences between the treatments.

Example 11: Synthesis and Meta-Analysis

The results of the three performance experiments described above are summarized in Table 11.1.

TABLE 11.1 Results of the individual studies Relative FI to the Relative to Relative to Trial Treatments (g/bird) control BWG (g/bird) the control FCR the control 1 Control 3245a — 1987ab — 1.633a — DSM 29870 3256a +0.3% 2026ab +2.0% 1.607b −1.6% DSM 29871 3221a −0.7% 2002ab +0.8% 1.609b −1.5% DSM 29872 3263a +0.6% 2038a +2.6% 1.602b −2.0% GalliPro 3203a −1.3% 1973b −0.7% 1.624ab −0.6% Max 2 Control 3573a — 2361a — 1.513a — DSM 29870 3542a −0.9% 2416b +2.3% 1.467b −3.6% DSM 29871 3606a +0.9% 2401ab +1.7% 1.501bc −0.8% DSM 29872 3515a −1.0% 2424b +2.6% 1.451a −4.2% GalliPro 3541a −0.9% 2398ab +1.5% 1.477ab −2.4% Max 3 Control 3217a — 2019b — 1.598a — DSM 29870 3295a +2.4% 2149a +6.5% 1.534b −4.0% DSM 29871 3281a +2.0% 2167a +7.3% 1.513b −5.3% DSM 29872 3230a +0.4% 2124a +5.2% 1.521b −4.8% GalliPro 3246a +0.9% 2103ab +4.2% 1.544b −3.4% Max a,b,cValues with different superscripts are significantly (P < 0.05) different from each other.

These trials having a similar experimental design, all the data obtained were pooled and combined in a meta-analysis (after having been tested for homogeneity). This meta-analysis involved 3 980 broilers in 160 replicates (32 replicates and 796 animals for each experimental group). The results are shown in Table 11.

Data (n=160) were subjected to a mixed model ANOVA, using the GLIMMIX procedure of SAS (SAS Institute, 2002-2012) to establish differences between diets. Pen was considered as the experimental unit. The model included diets (n=5) as fixed effect and experiment (n=3) as random effect. Results are reported as least square means. LS means were assumed to be different at P: 0.05.

TABLE 11.2 meta-analysis of three experiments showing the effect of dietary supplementation of the strain DSM 29870, DSM 29871 and DSM 29872 on broiler performance DSM 29870² DSM 29871² DSM 29872² GalliPro Max³ supplemented supplemented supplemented supplemented Parameters⁴ Control¹ group group group group FI (g/bird) 3343a 3360a 3361a 3356a 3347a Relative to the control — +0.5% +0.5% +0.4% +0.1% BWG (g/bird) 2145b 2208a  2202ab 2211a  2171ab Relative to the control — +2.9% +2.6% +3.0% +1.2% FCR     1.560a     1.530b     1.53bc     1.52c      1.550ab Relative to the control — −2.4% −2.2% −2.7% −1.1% ¹Group fed with the basal diet ²DSM 29870/29871/29872 supplemented group fed with the basal diet including strain DSM 29870/29871/29872 at 5.10⁸ CFU/kg of feed. ³GalliPro Max supplemented group fed with the basal diet including GalliPro Max at 8.10⁸ CFU/kg of feed. ⁴Means from 32 observations for each experimental group (796 animals/group). a,b,cValues with different superscripts are significantly (P < 0.05) different from each other.

This meta-analysis showed that the use of the strain DSM 29870, DSM 29871 or DSM 29872 in a corn/soybean meal-based diet significantly improved in average the body weight gain (+2.9%, +2.6% and +3.0%, respectively) and the feed conversion ratio (˜2.4%, −2.2% and −2.7%, respectively) with no effect on the feed intake.

Conclusion

In the working examples above, positive effects of strain DSM 29870 have been demonstrated on broiler performances (i.e., body weight gain and feed conversion ratio) fed a corn/soybean meal-based diet.

All the data obtained from the experiments described in the above examples also showed that the effect of strain DSM 29870 on the feed conversion ratio is due to its effect on the body weight. These effects might be associated with either health effect or metabolism improvement.

GalliPro Max showed no significant effect on the body weight gain in any of the working examples above and showed significant and positive effect on feed conversion ratio in one third of the experiments.

In the experiments described in the above examples, the better effect of strain DSM 29870 compared to GalliPro Max on broilers performance has been demonstrated. The effect observed using DSM 29870 were in average twice those observed for GalliPro Max.

Example 12: Determination of Monensin Compatibility

Monensin compatibility of Bacillus strains DSM 29869, DSM 29870, DSM 29871, and DSM 29872 was determined using a modified broth micro dilution similar to the method described in the Example 5. Briefly, a single colony of Bacillus spp. (from overnight tryptic soy agar plates) was inoculated into Mueller Hinton Broth (MHB) and cultured overnight.

Sterile media was the inoculated with the overnight culture and allowed to grow for 4 hours to test bacteria in log growth phase. Cultures were then diluted once more 1:200 into fresh MHB and 90 μL of this inoculated broth was added to the diluted monensin at the indicated concentrations. Prior art strains were also tested for comparison: NN019785, NN062266 (NRRL B-50013), NN062267 (NRRL B-50104), NN062278 (PTA-6507), NN062319 (FERM BP-1096), NN062440, NN062441 (DSM 17236), NN062439.

Strains:

Bacillus amyloliquefaciens DSM 29869 Bacillus subtilis DSM 29870 Bacillus subtilis DSM 29871 Bacillus amyloliquefaciens DSM 29872 Bacillus licheniformis NN019785 Bacillus amyloliquefaciens NN062266 (NRRL B-50013) Bacillus subtilis NN062267 (NRRL B-50104) Bacillus subtilis NN062278 (PTA-6507) Bacillus amyloliquefaciens NNO062319 (FERM BP-1096) Bacillus subtilis NN062440 Bacillus licheniformis NN062441 (DSM 17236) Bacillus amyloliquefaciens N N062439

Materials:

Monensin sodium salt (Sigma, CAS no. 22373-78-0, solubilized in 96% ethanol)

Mueller Hinton Broth (Becton, Dickinson and Company, 275730)

Tryptic soy agar (Becton, Dickinson and Company, 236920) Micro titer plates: Costar plate, polypropylene, flat bottom, Corning, 3628 Borosilicate glass tubes: Kimbale, 16×125 mm, 73500-16125 Adhesive gas permeable seals: Thermo Scientific, AB-0718

Preparation of Bacteria:

Bacillus spp. were grown overnight on tryptic soy agar plates (40 g/L) at 37° C. Mueller Hinton broth (21 g/L) was dissolved in water and autoclaved in glass tubes containing 5 mL of broth each. A single colony of Bacillus spp. (from overnight plates) was inoculated into Mueller Hinton Broth (MHB) and incubated overnight at 37° C. shaking at 200 rpm. A 5 mL glass tube of fresh, sterile media was then inoculated with 25 mL of overnight culture and allowed to grow for 4 hours at 37° C. Cultures were then diluted once more 1:200 into fresh MHB. 90 μL of this inoculated broth was then added to the diluted antibiotic at the indicated concentrations.

Preparation of Assay Plates:

Monensin was diluted into 96% ethanol to a concentration of 800 μg/mL. This solution was then diluted 10-fold into sterile phosphate buffer to a concentration of 80 μg/mL. A two fold dilution series was prepared in MHB down to the concentration 2.5 μg/mL. 10 μl of each dilution and of each antibiotic was pipetted into a micro titer plate. Later, when the antibiotics were mixed with the suspension of bacteria, the samples were diluted 10×(10 μL sample in a total volume of 100 μl). This resulted in the final test range of 0.25-8 μg/ml.

90 μl of the bacterial suspensions were added to the assay plates. The assay plates were then covered with an adhesive glass permeable seal and incubated overnight at 37° C. shaking at 200 rpm. The maximum compatible concentration was determined similar to a MIC analysis as the concentration above that which inhibited 80% of bacteria as detected by the unaided eye.

Results:

A potential challenge of delivering Bacillus spp. in feed is the common use of antibiotics as growth promoters in feed. Therefore it is necessary to determine the compatibility of strains with commonly-used feed antibiotics in order to identify any potential conflicts with use as a direct fed microbial. Therefore, the monensin compatibility of Bacillus strains DSM 29869, DSM 29870, DSM 29871, and DSM 29872 were determined along with prior art strains. Bacillus strains DSM 29869, DSM 29870, DSM 29871, and DSM 29872 indicated a higher level of compatibility with monensin than most of the prior art strains included herein: NN019785, NN062266 (NRRL B-50013), NN062267 (NRRL B-50104), NN062278 (PTA-6507), NN062319 (FERM BP-1096), NN062440, NN062441 (DSM 17236), NN 062439.

TABLE 12.1 Monensin compatibility results Monensin Species Product Name (μg/mL) NN062677 DSM29870 Bacillus subtilis 2.7 NN062673 DSM29871 Bacillus subtilis 2.0 NN062683 DSM29872 Bacillus amyloliquefaciens 4.0 NN062676 DSM29869 Bacillus amyloliquefaciens 2.0 NN019785 Bacillus licheniformis BioPlus 2B (Chr. Hansen) 0.8 NN062266 NRRL B- Bacillus amyloliquefaciens Eviva Pro (Dupont) 1.1 50013 NN062267 NRRL B- Bacillus subtilis Eviva Pro (Dupont) 1.1 50104 NN062278 PTA-6507 Bacillus subtilis Eviva Pro (Dupont) 1.4 NN062319 FERM BP- Bacillus amyloliquefaciens Calsporin (Calpis) 2.2 1096 NN062440 Bacillus subtilis GalliPro Max (Chr. Hansen) 0.4 NN062441 DSM 17236 Bacillus licheniformis GalliPro Tect (Chr. Hansen) 0.9 NN062439 Bacillus amyloliquefaciens Clostat (Kemin) 2.1 

1. An animal feed or an animal feed additive comprising a Bacillus strain selected from the group consisting of a Bacillus strain having deposit accession number DSM 29870, or a strain having all of the identifying characteristics of Bacillus DSM 29870 or a mutant thereof that has antimicrobial activity against Clostridium perfringens; a Bacillus strain having deposit accession number DSM 29869, or a strain having all of the identifying characteristics of Bacillus DSM 29869 or a mutant thereof that has antimicrobial activity against Clostridium perfringens; a Bacillus strain having deposit accession number DSM 29871, or a strain having all of the identifying characteristics of Bacillus DSM 29871 or a mutant thereof that has antimicrobial activity against Clostridium perfringens; and a Bacillus strain having deposit accession number DSM 29872, or a strain having all of the identifying characteristics of Bacillus DSM 29872 or a mutant thereof that has antimicrobial activity against Clostridium perfringens.
 2. The animal feed or the animal feed additive according to claim 1, wherein the Bacillus strain comprises 16S rDNA that has more than 98% sequence identity to SEQ ID NO: 1 and/or more than 98% sequence identity to SEQ ID NO: 2 and/or more than 98% sequence identity to SEQ ID NO: 3 and/or more than 98% sequence identity to SEQ ID NO:
 4. 3. The animal feed or the animal feed additive according to claim 1, wherein the Bacillus strain is characterized in that: i) the Bacillus strain is non-hemolytic, ii) the Bacillus strain has antimicrobial activity against Clostridium perfringens, and iii) the Bacillus strain improves body weight gain and/or feed conversion rate in chickens fed with the Bacillus strain.
 4. The animal feed or the animal feed additive according to claim 1 which further comprises a carrier.
 5. The animal feed or the animal feed additive according to claim 4, wherein the carrier comprises one or more of the following compounds: water, glycerol, ethylene glycol, 1, 2-propylene glycol or 1, 3-propylene glycol, sodium chloride, sodium benzoate, potassium sorbate, sodium sulfate, potassium sulfate, magnesium sulfate, sodium thiosulfate, calcium carbonate, sodium citrate, dextrin, maltodextrin, glucose, sucrose, sorbitol, lactose, wheat flour, wheat bran, corn gluten meal, starch and cellulose.
 6. The animal feed or animal feed additive according to claim 1 for the treatment of necrotic enteritis and/or the treatment of a Clostridium perfringens infection.
 7. The animal feed or animal feed additive according to claim 1, comprising at least the Bacillus strain DSM
 29870. 8-9. (canceled)
 10. A method of improving one or more performance parameters of an animal selected from the group consisting of: improving the feed conversion ratio, improving the body weight gain, improving the European Production Efficacy Factor, improving the feed efficiency and improving the health, comprising administering the animal feed or animal feed additive according to claim 1 to the animal.
 11. The method according to claim 10, wherein the animal feed or the animal feed additive comprises the Bacillus strain DSM
 29870. 12. A method for feeding an animal comprising administering an animal feed or an animal feed premix comprising at least the Bacillus strain DSM 29870 to said animal optionally in conjunction with other animal feed ingredients.
 13. The method according to claim 12, wherein the animal is selected from the group consisting of poultry and swine.
 14. A feed or a feed premix for improving the performance of poultries and swine comprising at least the Bacillus strain DSM
 29870. 15. The feed according to claim 1, wherein the bacterial count of each bacterial strain is between 1×10⁴ and 1×10¹⁴ CFU/kg of animal feed, preferably between 1×10⁶ and 1×10¹² CFU/kg of animal feed, and more preferably between 1×10⁷ and 1×10¹¹ CFU/kg of animal feed and even more preferably between 1×10⁸ and 1×10¹⁰ CFU/kg of animal feed.
 16. The feed additive or feed premix according to claim 1, wherein the bacterial count of each bacterial strain is between 1×10⁷ and 1×10¹⁹ CFU/kg of animal feed additive or kg of feed premix, preferably between 1×10⁹ and 1×10¹⁷ CFU/kg of animal feed additive or kg of feed premix, and more preferably between 1×10¹⁰ and 1×10¹⁶ CFU/kg of animal feed additive or kg of feed premix and even more preferably between 1×10¹¹ and 1×10¹⁵ CFU/kg of animal feed additive or kg of feed premix. 